Help:Editing

Wikipedia is a wiki, meaning anyone can edit nearly any[1] page and improve articles immediately. You do not need to register to do this, and anyone who has edited is known as a Wikipedian or editor. Small edits add up, and every editor can be proud to have made Wikipedia better for all. There are two editing interfaces: the new VisualEditor (VE) and classic wikitext editing (wiki markup).

Editing tutorial for Wikipedia