You're right about the triangle, Mick.
On a forum list of topics, the column on the far right is "Posted" and it shows the time, date and member with the most recent post in that topic. The triangle next to the word "Posted" at the top of the column normally points upward. That sorts the topic list showing the newest post at the top of the list.
If you click on the word "Posted" or the triangle, the list of topics flips over, displaying the oldest post at the top of the list, often back to year 2000. If you want to get back to normal, listing newest first, click on "Posted" again.
There is another variable that will be an issue about "look at page 69." Members can specify how many topics to list on a page. The default number is 30, but you can adjust that in your Preferences to any reasonable number. Preferences can be found in your "My Stuff" menu. You can also specify how many posts in a topic will be displayed on each page.
Remember that choosing a higher number can slow down the delivery of the page to you, especially if you are in dial-up.
You should be able to highlight the URL in your browser's location box, copy it and paste it just like any other text. If part of the URL is missing, it will probably not work and could show an error message. A normal URL for a forum topic would look like this:
http://www.oldgas.com/forum/ubbthreads.php?ubb=showflat&Number=129148#Post129148The #Post and the number after it can be left off, but everything else is essential to get to that specific topic to display in the normal way.