How nice for you. Then you can keep yours turned on. I wasn't looking for reviews, just how to turn it off. Getting multiple emails about every thread I comment in is extremely obnoxious. I can keep track of threads I've posted in by memory without the emails.
And that is where this comes into play:
UserCP > Edit Options > Messaging & Notification > Default Thread Subscription Mode
But then again, not being nice is probably preferred here.
And since you only posted a few times, of course you can use your memory. But once you go beyond a certain amount of posts and threads, the Subscriptions are very helpful, even without email notification. Please try that first before coming down on others trying to help you.