I've looked at all the help for changing footers but I still have the same problem - I go to appearance, editor, footer.php, change the telephone number that had been previously entered, hit update, and it goes right back to the old telephone number. I checked the permissions and my login is the "owner" and has full permissions for every file.
I'm also unable to update plugins or wordpress themes/editions with the login I use for Wordpress. And...I can't seem to get pictures to load at all. Maybe those three go together, but if they don't, I'm most frustrated about the footer issue.
I should probably also add that someone else set up the site, and did so under a different computer login. HOWEVER, when I check the details, my login has every single permission the admin does. So I don't think this is the problem. It also says my login is the "owner."