I sent a pm to eric nguyen and he cancelled my subscription
There does not appear to be an option to do this in the user profile (nor to subscribe if you didn't originally). I'd suggest sending a PM to Eric Nguyen https://www.instructables.com/member/nagutron/ , and both ask him to do the unsubscribe for you, and also suggest adding this option to user profiles.
I did this and he just seemed to make it so that I cant click into the e male but I'm still getting them.
Usually when you subscribe to a newsleter it has an option at the bottom of the email. try searching around there. If not, email them back from the address they sent it from.