Welcome to the forum. Very nice chap work.
Posting pictures is pretty easy. Seems like you got it since you have some chaps posted. Here are the instructions anyway. Once you create a topic or add a reply, underneath the white text box is a box that says "attachments". Over to the far right of that box is a button that says "choose file", click this, navigate to your picture, (total pictures must be under 1MB to post), and the click the green "upload" button. once it uploads the "manage current attachments" tab (on the left) will have the number of attachments linked. If it says 0, then your file has not uploaded. If you have the files uploaded, the click "Add Reply"
Marlon