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You may have to REGISTER before you can post. Registering is FREE, gets rid of the majority of advertisements, and lets you participate in giveaways and other AlpineZone events!
It's in your user options .
User settings --> Edit Options --> Subscriptions
That will only change the subscriptions for future threads that you post in. Current subscriptions won't be affected (unless something has changed that I'm unaware of). My link above covers how to take care of old subscriptions too. It may take a few minutes, but it's easy.