Does "subscribed thread" just mean a thread you have started or replied to or is there more to it? I havn't joined any communities like this and am completely new to it, so I havn't got a clue. When I hear subscription, I think magazine, or something you pay for. Thanks for any answers.

A thread "Subscription" means you'll be alerted when responses are posted to a thread.

You can subscribe without email notifications (meaning responses to the thread will appear in your User CP under "Subscribed Threads"), or with instant email notifications (you receive an email every time a response is posted), daily notifications (you receive an email every day with all of the responses posted that day), or weekly notifications (you receive an email every week with all of the responses posted that week).

And what do I have to do to subscribe my threads?

You can set a default subscription option for all threads you post in by selecting a subscription option in your "User CP" under the "Edit Options" page. Select a "Default Thread Subscription Mode" option.

You can also subscribe to any one thread from the "Advanced" posting page for that thread (not from the Quick Reply - click "Go Advanced" under the "Quick Reply" box).

thanks, that answered my question.