Hi Mark, One thing that helped me navigate the site was to realize that there are several ways to browse for posts of interest to me. One way is to use the search button to find information on a particular topic. This leads to posts on the subject both recent and from several years ago. Another way is to go to the list of different support groups, click on each in turn and read posts that you find there. If you just want to read recent posts or those that have been posted since you have been on last, go to the New Posts button.
To start a new conversation, you need to go into a specific support group to have the New Thread button appear.
If I have gotten anything wrong here, I hope those more experienced with the site will explain.