Profile Header and User Card Background - where are those?

As per subject, what is the purpose of those and where those can be found? When I go view my profile I can’t find neither (and I have one photo uploaded already).

The only way I’ve found to view your profile is to click on the profile pic/avatar to the left of any of your posts…I think this replaces the signature block and profile view.

Yes but when I go into the profile none of pictures appear to exist anywhere in there. Very strange