The instructions Dave gave you will stop all future email notifications. For all past threads you posted to where you're getting those notices of new posts, go back to the User CP > Your Control Panel > List Subscriptions & delete all the ones listed there. This way you'll get rid of all email notifications both old & new.
If you want to be on a forum that is exclusively Forest River products, you can join iRV2's
sister forum
We hope removing the notifications is enough for you to stay. You can gain a lot of knowledge from SOB members here. But if you want your account on iRV2 closed, please use the Contact Us link (found at the bottom of an page) to request closure from a site administrator.
Lori-