A.B.
When you post a question, people are able to leave responses, but there's not a convenient way to have a back and forth conversation. If you want to comment, you can add it to either the "So What Happened" section or you can Edit your response and clarify things at the end of the post, direct comments to specific posts from others, etc.
If you want to look at your profile, look at the top right hand of your page. It will have an inbox number showing how many messages are in your personal account, and a thing that, for you, would say "C.'s account". This spot has an arrow with a drop down menu that allows you to access your profile, inbox, etc.