I know it seems like it's easy. But it isn't working. I'm trying to get Buddypress cover image working for profiles and groups, and am confused. I think I need some kind of a walkthrough. I've installed BuddyPress Cover Photo, that didn't work. Then realized ( supposedly ) that functionality for this is included in latest Buddypress, so deactivated that and still it didn't work.
Went into the Options panel on Buddypress and set a constant theme for profiles (just to see). Did not work.
Went into FTP and put in some code I found on Buddypress into functions.php.
Did not work.