Hi Hanna3, if you like I can assist with your issue of losing posts or threads.
When you discover a thread you want to participate in, use your web browser to bookmark that page and add the bookmark to a folder called "beyond blue bookmarks" or similar. Then with each new thread, just click onto favourites and send it to the appropriate folder.
Another way is to recall the time/date you first looked at the thread, and open up your web browser history and locate that time in your chronologically ordered history. It'll show up there certainly, unless u actively tell the browser to not save browsing history.
Feel free to ask questions or google the process on youtubes for your particular browser.
good luck have fun = glhf dng.