easy as I finally found out.
when you receive an email from a "fan" or whatever, at the foot of the email will be the following:
You can change the frequency of this type of notification. Visit our Terms of Service or Privacy Policy.
FanBox - 255 G Street #723, San Diego, CA 92101, USA
click on "change" (underlined in blue) an a box comes up with what you want to change. at the foot of this box is an option to totally delete fanbox account. :-)
