cancel my account (Mexico City)

hi i am greatfull for belonging to this group for one year and a half however for personal reasons i no longer want to be part of this. Nothing bad is just personal reasons.
how can i cancel my account and subscription ?
i am a basic member so there are no credit cards envolved.
also i already tried in different parts of the web site but i cant find the way of doing this cancelation.

thank you, lucy