Yoda, all games have to be played with someone on the tourney list. Marking a round just means, in most cases, that person has already played that round and posted a score. They are there only so you can play your round. A marked round doesn't count for them.
Sucks sometimes when you shoot better marking then you already posted.
Usually the person you are marking for would post to the forum. But all you have to do is ask during the game.
Gary
ps...It's not that hard to learn how to post into the forum. First couple of times you will make mistakes, we all did. But after that it becomes old hat.