A couple of newer members have been puzzled as to how to reply to comments on their posts, so here's my quick tip as to why that is...
If you are not logged into the board you can only see the public parts of the board, and they will be in Read-Only mode. To be able to reply to a post you need to be logged in, so do that first, then once logged in you will see the reply and other options available to logged in members. (You will also see the members-only parts of the board such as the cafe for general chat.)
See the screenshot below to see where the reply functions are once you are logged in and viewing a topic.