Check out the search—the magnifying glass icon top-right.
If you click the magnifying glass icon in the top-right, you can search for words or phrases. Since you are viewing a specific topic—right now as you are reading, you are in a specific topic—the search will restrict to the current category. In this case, searching with the #members-only:archives category. Search results appear in real time, and if the list is long, there will be a link at the bottom of the list to view the search results on one page.