[header] How to do clan wars on clash of clans [title] Start a clan war. [step] If you're just a member of clan, ask in your clan chat for a leader or co-leader to start a clan war. [substeps] If you don't know any staff in your clan, click on view clan and browse through a list of your clanmates. 
Below their username and stats, you will see their permissions. Keep in mind that in mind that you need at least ten active players in your clan to declare war.