Steem.center runs with Mediawiki, the same wiki engine of Wikipedia, you can access the tutorial of formating and editing pages in: https://www.mediawiki.org/wiki/Help:Editing_pages
If needed we also have a template suggestion for new Steem.center wiki pages in: https://www.steem.center/index.php?title=Steem.center:Templates
I hope it can help, any doubts just ask here or in the Steem.chat wiki channel in: https://steemit.chat/channel/wiki