Quick guide to warclans search
Clan Live Search
If you click on the settings icon ( green) near the search bar, then hit live search and then search for your clan. It should find your clan and you can add it.
Click on the () when you get () icon, then hit search. It should find player, if not use Live Search to add your Clan.
Click on the () icon, then hit search. It should find Clan, if not use Live Search.