If your Guild Leader is inactive for at least 21 Days, the highest ranking active members are able to demote the Guild Leader and promote themselves to Leader.
There can only be one Guild Leader per Guild. The original Guild Leader must be demoted before someone can promote themselves to be the new Leader. Generally, a player of a higher rank than you must be inactive to be removed from the Guild.
TIP: Inactive Guild members will have a red and white sleep icon next to their name on the Guild Roster.
Removing an inactive Guild Leader
To demote, promote or kick someone from the Guild, select the inactive player's name. On the menu that appears select the action you'd like to take.
Now that you've changed your Guild Leader, you can find information on how to Manage your Guild in this article here.