How to go to the first unread post on a thread

I want to go to the first unread post on a thread but can’t see how to do this. It is probably staring me in the face but I can’t see it!
Usually there is a little button to press.
Please help!

If I understand you correctly (and I may not), that’s a BA thing.

If you’re going to keep track of the threads in which you’re interested here, you’ll need to remember where you left off.

The good news; because we’re not vertically linear, it’s much easier to do here.