Here are the steps on how to leave in your Guild:
1. On the Hideout tap "Guild" icon and go to "Home" button.
2. To leave in your Guild, just tap the "Profile" button.
3. Then after that, tap the "Edit" button.
4. The "Leave" button will appear on the upper left side on your Guild profile then Tap "OK" if you want to leave your guild.
5. Message prompt will appear. Tap the "Yes" button if you really want to leave your guild.