As far as I could realize, in my chrome, the threads with new unread posts look the same as the other ones. I never know what's new to read.

Am I missing something? Is there a way to put a mark on threads with new posts?

Sorry if you already answered this. I didn't have time for a long search about it.

The new posts are always on top.

When you login, there will be a green check on threads which contain posts you haven't read. There will be a green dot on threads in which you have posted in. If you'd like to know the meaning of other symbols, you can view the legend at the bottom of any forum.

viewforum.php?f=8

You can select how far you'd like to go back by clicking View Active Topics at the top left on the index page, then selecting the time frame you wish to view at the bottom.

You can mark all forums or individual forums "read" by clicking the "Mark Read" links in the forum dividers.

Other than using these links at the top,
View unanswered posts | View active topics | View unread posts | View new posts | View your posts

The yellow box on the left will send you to the last unread post in a thread.

It was really useful. Thanks.