We hate to see you go, but if you insist...
Login to your band profile and click "Edit My Band Profile". From the "Profile" tab, click “Disable Account”. You’re welcome to come back anytime.
If you would like to permanently delete your account, email email@example.com.
If you need to transfer the profile to new management, simply go to settings and then enter the new email of the person you'd like put in charge.