I found the script controlling this element. Problem solved.
Ok. Found the problem. Solved now. Thanks to all for your suggestions. The CSS script that restricted width was under colour red.
I don’t have an account here (that I’m aware of). I didn’t create the site.
I don’t see any error messages. As I said, I didn’t create this site. I am a rookie when it comes to WordPress. We had “theme my login” working and I could upload files and update site. Now, “Login” doesn’t appear on sidebar or doesn’t appear on Member’s area.
