To Add Facebook Cover Photo On iPhone:
1. Change Your Cover Photo on the Go
You can now change your cover photo from the mobile app.
Head to your profile and tap on the camera icon, displayed at the bottom-right of your cover image.
You will now have the option to snap a new pic, or select one from your iPhone’s Camera Roll.
To change facebook cover photo on iPhone:
Tap the list button in the top right corner, it’ll slide out. that Tap on your name (on the top of the list.) Than your cover photo and profile will be displayed. on the bottom right of your cover photo theres a camera icon. go ahead and touch that to change your photo