how to withdraw membership from yahoo group?

Sign in to the group you wish to leave.

Near top of page and to the right of "Welcome yourname:, click on "edit membership".

Scroll all the way down to the bottom of page and click on "Leave Group", then confirm that you wish to leave group. You will be instantly unsubscribed from that group.

You might receive an email letting you know that you have been unsubscribed from that group.

It might take a couple of days to stop receiving email messages from the group. Should you decide to rejoin the group later, the owners usually will welcome you back.

You can edit which profiles, eMail message delivery and groups membership at:

http://groups.yahoo.com/mygroups?o=2&edit=1

You can also unsubscribe from your e-mail address by sending an e-mail to the group's unsubscribe address which will look something like this: group-unsubscribe@yahoogroups.com