That FAQ link redirects registered users to their product list, where they can then use the bulk price watch editor. Unfortunately, that editor doesn't yet allow you to modify the email or Twitter accounts associated with each price watch.
I will definitely put that into our todo list though, it seems like an obvious upgrade for the bulk editor. And, if you want to email me with your username / email, I will manually remove your email address from your price watches.
Just send a message to
dan@shup.com and I will get that taken care of.