Look at the URL. After the ? you will see a list of "variables" in the form X=Y (e.g. f=16, t=5072), with each variable separated by an &.
The way pages are navigated is by using the variable "start" and some offset. For example "start=0" means that you want to start with the first post in the thread (computers always start at 0 for math purposes), "start=1" means you want the second post in the thread. Each page has 40 posts, so if you want the first post of page 2, you want "start=40". And if you want the first post of page 3, you want "start=80".
Thus to navigate through the pages, simply add an & to the end of the URL, then add the keyword start followed by = and the offset which can be calculated as (<page> - 1) * 40
Page 1: &start=0 (or nothing, because 0 is assumed)
Page 2: &start=40
Page 3: &start=80
Page 4: &start=120
Page 5: &start=160
etc.
If you want the last page, check how many pages there are and calculate, or you can overshoot (in which case the last page of posts will be shown)
Last Page: &start=4000 (as there is no thread with more than 100 pages)
Thank you for bearing with us while this gets sorted out
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