I click on the "Recent Post". It sorts all of the posts from the newest to the oldest. I then click on the date on the far right. That will take you to the last post for that topic. I wil then scroll up watching the date and time of the previous posts until I reach the first one that I have not read and continue from there. If you are logged on the unread topic titles will be in bold and turn to regular text once you have read it. If someone makes an additional posting after you have read it the title font will go back to being bold.