To put up a new profile picture or change an existing one, just follow these steps for your smartphone. The steps are the same using both iPhones and Android devices: 1. Open the Facebook app on your device. 2. Tap the three horizontal lines on the bottom right of the screen. 3. Select your profile at the top of the page. 4. Hit the camera icon located in the corner of your profile picture. 5. Tap “Select Profile Picture.” 6. Choose a photo from your camera roll or existing Facebook albums. 7. If you wish, you can crop your image. When done, hit “Save.”