Raven
If you post in a thread then you're automatically subscribed to it.
If you want to subscribe to another thread, then go to 'thread tools' at the (almost) top right of the page.
To delete old ones, go to 'User CP' and a menu will drop down on the left. Subscriptions at the bottom. Tick the boxes next to each and at the bottom of the page there's another drop-down where you can select 'delete'.
If that's not very clear, please ask and someone will help out!
Good to see you here.