You can choose Clan from list of Clan ranking and request to join Clan by search clan name or ID .
Click on button “Member” to enter to see member in Clan or click on button “Apply” to request to join clan and wait permission from Clan Captain.
After join a clan , you can’t join other clan anymore. unless you leave your current clan and wait for 3 days ( Count from leave day) in order to request to join other clan by set password in (Setting clan password)again to join new clan.
If you are Captain, you can change password (Admin Password) of your Clan. Note: Captain can’t lost or forgot (Admin Password), check the below image:
If you are Captain, you can kick member out of your Clan:
If you are Captain, you can promote your clan member to Official: