For complex editing and manipulation of PDF files, you will need to purchase Adobe Acrobat. If you just want to be able to open or export existing files as PDF files, then there are free options. Acrobat Reader, Foxit Reader, or Windows Reader App are a few free options for viewing .pdf files. You can create a document in a word processor like Word, or Google Docs and save it as .pdf file, but further manipulation of that PDF will not be possible without Acrobat. Open Adobe Acrobat and press Tools > Create PDF. This is where you start when importing files to turn into a PDF or starting a new PDF from scratch. There are a number of import options to choose from, including importing a single or multiple files, a scanned file, a webpage, or the contents of your clipboard. Adobe limits its file support to Microsoft Office (2007 and later) or OpenOffice filetypes, as well as basic text (.txt, .rtf), image files, or other adobe products. Selecting a file will create a PDF copy of that file in the same location on your computer as the original file. With the file now opened, press "Edit PDF" and select a highlighted box of text. You can either type out the changes you want or utilize the options in the Format section. Press "Edit PDF" and select any highlighted image. Use the options in the Objects section to manipulate the image.
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One-sentence summary -- Determine how you will be using PDF files. Create a PDF file from an existing file. Edit text in the imported file. Edit images in the imported file.

Tap the Gmail app icon, which resembles a red "M" on a white background. This will open your Gmail inbox if you're logged in. If you aren't logged in, enter your email address and password when prompted. It's in the top-left corner of the screen. A pop-out menu will appear. This is at the top of the pop-out menu. Doing so prompts a drop-down menu to appear. It's in the drop-down menu. A new menu will open. This option is in the menu. It's at the top of the list of options. You may be prompted to allow Google to sign you in. If so, tap Continue or ALLOW. Tap the "Email or phone" text box, then type in the email address for the account you want to use. It's below the text box. Type in the password you use to log into your Gmail account. It's at the bottom of the page. Doing so will both add the account to your list of currently signed-in accounts and open the account's inbox. If you want to switch to a different signed-in account, tap , then tap the account's profile image at the top of the menu. If the account doesn't have a profile image, you'll tap the colored circle with the account name's first initial instead.
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One-sentence summary -- Open Gmail. Tap . Tap your current email address. Tap Manage accounts. Tap Add account. Tap Google. Enter your email address. Tap NEXT. Enter your password. Tap NEXT. Switch between accounts.

You want both ends hanging down on your chest. Adjust the cravat so the right is slightly longer than the left. Bring the right side across the top of the left side. The left and right sides should now be back on their original side, but the right side is now wrapped around the left. Wrap the right side around the back, and then pull the right side up through the center of the neck band. Fold the fabric over the top of the neckband so it hangs down the front center of your chest. Tuck the extra fabric into the opening of your collared shirt. Follow the same procedure as for the casual cravat, but instead of tucking the excess fabric into your shirt, tuck it into your vest. If you like, use a cravat pin to keep the top layer of fabric in place. Take the fabric that you pulled up and over the neck band, and tuck it into the fabric loops that you created by wrapping the cravat. Adjust the knot and tuck the excess fabric into your shirt or vest.
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One-sentence summary -- Hang the cravat around your neck. Loop the right side behind the left. Cross the right over the front of the left again. Tie a casual cravat. Tie a wedding cravat. Make a scrunchie wedding cravat.

It's the blue icon with a white bird. Log in with your account, if you haven't already done so. This will open the menu tab. You'll find this above the "Profile" option. This will leads you to the "Followers" list. Doing so takes you to their account page. This option is located at the top-right corner of the app. A confirmation message will pop-up on your screen, after doing so. This officially blocks your selected follower. You'll find this option on the top right side of your screen. Your follower should now be unblocked, but they will no longer be following your account.
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One-sentence summary --
Launch the Twitter app. Tap on your profile picture, at the top-left corner of the app. Tap on the Followers counting. Tap a follower you wish to block. Tap the button. Tap the Block option. Tap Block when prompted. Tap the red "Blocked" option. Tap YES in the resulting pop-up menu.