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Open Pinterest. Tap the "Search" tab. Tap the "Search" bar. Type in a topic, a username, or another search query. Tap a search suggestion. Tap a post you'd like to pin. Tap Save. Tap a board.
It's a red app with a white, stylized "P" on it. If you're logged into Pinterest, opening the app will take you to the home page (or, at times, the last tab you had open). If you aren't logged in, enter your email address and password, then tap Log In. It's the magnifying glass icon that's at either the bottom of the screen (iPhone) or the top of the screen (Android). You'll see this at the top of the screen. It should relate to items you'd like to pin. As you type, you should see search suggestions appear below the search bar. You can also tap your device's "Search" button to search for the word or phrase you typed. Doing so will open it. You may need to scroll down through the results to find the post you wish to pin. It's in the top-right corner of the screen. Doing so will pin your selected post to the board in question. You can also tap Create board to create a new one.