Board Thread:Support Requests - Community Management/@comment-27364552-20140726214844/@comment-4143277-20140726215317

You should be able to do that from their userpage or talk page/message wall. Alternatively, you may type in the url, after /wiki/:

Special:Contributions/username

For example on Community Central, it would be http://community.wikia.com/wiki/Special:Contributions/Ozuzanna for myself.