how do I cancel membership to this forum?

 

Just don,t vistit the site anymore and in options uncheck "Notify by email." and its like you never where ever here.

Works with Face book also.

 

Yup!
I asked about canceling a membership to a Goldwing forum as I don't own one anymore. I figured it would "help" the site owner by freeing up space but the owner told me it wouldn't free up much, if any.
So I just quit visiting and deleted the site from my bookmarks.