Tap the menu in the top left corner of the screen.
Go to Settings > Edit Profile.
Inside the 'Edit Profile' screen, scroll all the way to the bottom of the screen until you see the "Delete Account" button.
Tap "Delete Account" and wait to confirm the action.
(If you have pending payments or a campaign running, you won't be able to delete your account)
Note: Once you delete your account, all your data will be lost.