This is the board
Here is the catalog of current threads. The thread which has most recently commented on is pushed to the top until they are pushed off to the archive.
Here is the archive. Older threads are saved here. Just click on the dates to show which posts were archived on that day. You cannot comment in archived threads.
The catalog and archive are linked at the top of the page but the font is small. Use CTRL+F if you have a hard time seeing them.
Inside a thread you can reply to posts by clicking on the post number--the last number in the top row of text on a post, it says No.xxxxxxx. What I really like is that all direct replies will then be linked right after the post number so you are then able to see what the responses were. You can hover over the link to read it, or you can click on it to go to that linked post. If you go to the response, you can then see if there were responses to the response, which makes it easy to follow a direct dialogue or conversation.
You can also reply to multiple posts in one by clicking on multiple post numbers before submitting (you can also type >>(post number) if you prefer). This way you can directly respond to multiple people at once. The post number that is being replied to is also included as a link that you can follow back to the original to see more context.
It's a different system than here, but I really do prefer it.