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It's a tab at the top of the page. Doing so opens the Messages pop-up window. This is in the top-right corner of the pop-up window. Click the name of the follower you want to message. You can also type the name of a follower into the search box if you don't see the follower listed here. You can select more than one follower here, but you must select at least one follower. Keep in mind that, while you can select people who aren't following you, sending a message to them will deliver the message to their "Requested" Messages folder instead of their inbox. It's in the bottom-right corner of the window. Type your message into the text box at the bottom of the window. As with tweets, you can add a photo or a GIF to your message, though you can't add both (or more than one) of them at the same time: Photo Click the mountain-shaped "Photo" icon, select a photo or video from your computer, and click Open. GIF Click the GIF button, search for a GIF to use, and click the GIF. It's to the right of the message. This will send your message to the recipient. A grey checkmark under your message means it was sent. A blue checkmark means it was viewed.
Click Messages. Click New Message. Select a follower. Click Next. Enter your message. Add a photo or GIF if you like. Click Send.