Thread:Project:Support desk/MediaWiki header footer issue/reply

Don't know what google dfp is, but...

The header can be edited by editing the page named MediaWiki:Sitenotice on your wiki (Must be wikitext).

Arbitrary html can be added to the footer via the page MediaWiki:Copyright.

See manual:System messages for details. For more detailed modifications you may have to make your own skin. See manual:Skinning

If you're looking for ads, there are several extensions available that support adding advertisements. -- p.s. It should be noted that MediaWiki is not designed to be a CMS and lacks some of the features typically associated with CMS's.