It's a blue app that contains a lowercase, white "f.", It's in the upper-left corner of the screen, at the top of your Newsfeed, in the status box next to "What's on your mind?"., These are the photos in the "Featured" section of your profile, below your Bio and above the status box that asks, "What's on your mind?", It's below the photos that appear in this section.

If you haven't added any featured photos yet, tap Add Featured Photos in the same section.
 Tap on a photo icon in the center of a gray square or in the lower-left corner of an existing photo.

Featured photos are supposed to help others get to know you a little better, so choose photos that tell something about yourself.
You can add up to five featured photos.
Featured photos are always public and can be seen by anyone., Do so if you want to add a photo from your device's camera roll/gallery., Select this option if you want to use a photo from your Facebook albums., Tap the blue ⓧ in the upper-right corner of any photo to delete it., It's in the upper-right corner. Your featured photos will appear just below your profile picture on your Timeline.
Open the Facebook app.
Tap your profile picture.
Scroll down to Featured Photos.
Tap Edit Featured Photos.
Add or change photos.
Tap Upload Photo.
Tap Select Photo on Facebook.
Delete photos.
Tap Save.
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