If you want to change the leader of the guild (Count) - it must be made by the leader himself via guild management window.
If the leader of the guild is unavailable, or you have some disagreements - you should leave the guild and establish a new one.
Once previous guilds member count drops below 10 - guild monument will be deleted in 5 real hours or less, and you will be able to establish a new guild monument in the same place.
We are currently looking into optimizing this process and in future, we may add some functionality to make this process easier.
Please contact us if you have any questions.