How to subscribe to a thread

I know that if i reply to a thread I’m automatically subscribed, but I can’t find out how to subscribe without a reply. I hate to add a useless reply just to subscribe. I’m sure someone can help this computer-challenged nana. TIA.

If you click on Post Reply, then there is a place after you scroll down that will allow you to subscribe.

At the top of the page (directly above the original question or the top reply on subsequent pages, to the right of the “View First Unread”) is a drop down menu entitled “Thread Tools”, there’s a choice there to subscribe to a thread.