Thread:Project:Support desk/Publishing pop-up to be disabled/reply (9)

First, let me make sure that what you mean when you say "pop-up". I'm thinking of something like this. MediaWiki doesn't do a popup like that with the copyright warning. Nor do any of extensions you have installed.

If you mean "I just saw this message after installing MW" then you can remove it by blanking out the page MediaWiki:CopyrightWarning on your wiki.