If you are reading someones posts, using the SHOW POSTS function. And they have a lot of posts, you may want to go to a certain page of the listing. So in the bottom right corner it say pages 1-xxx Then there is a black downward facing arrow. If you click on that arrow then you can enter a page number.
Took me about 2 years to figure that out.
Also the forum defaults can be changed to put more or less posts on a page.
Or you can change what is displayed to look at older posts.
There is a lot of information here but it takes some work to find it all.
