It's easy enough when using the Internet browser on a laptop or tablet (Just click on "last page"), but it takes forever on the app.
I started a thread a couple of days ago and every now and then I check to see if there are any new posts. If there are, I open the thread but then have to scroll and scroll and scroll to reach the end.
There's a little button with an up arrow which whizzes you straight to the top of the page. I expect that would be handy if you wanted to reread the OP. But there's no equivalent button with a down arrow that would take you straight to the last post. I'm sure lots of people would find it really useful and it would get more use than the existing up button.