I too was lost when I read his op. The way I follow a thread is to look at the pages of how long the thread is. If the thread is new you would most likely be on page 1 or perhaps page 2, next go to the top of page 1 and scroll down reading all along, then go to page 2 and do the same. Some threads here have many, many pages because the thread goes on and on, if you don't want to start from page 1, then jump in anywhere near the end pages.
The pages are at the left of the screen just click the desired page you want to start at.