Unsubscribe?

How can I unsubscribe from a single thread?
Sometimes I have too many of them.

And while I'm at it -- sometimes I have nothing to
say but want to lurk around and follow a thread.
How can I subscribe to a thread without posting?

How can you subscribe?
At the top left corner of the original post, there should be a pull down thing that says "options"
There should be "track this topic"

Let me look around the options to figure out how to unsubscribe.

Still haven't figured out the unsubsribe part to it ..

Did you find the subscribe part, at least?

The subscribe part I found. Thanks.

But not the unsubscribe part. I guess we don't have one.