NB. The Score Card section is currently disabled until further notice.
If you want to leave a comment on his Score Card, scroll down on a users profile below his Hook Up Info, to where it says "Score Card." Enter your comment in the text box, and then click post. You'll get a pop-up message reminding you that you won't see your comment appear on his profile until he approves it.
After you've posted your Score Card comment, he'll automatically get an email saying he has received a new Score Card comment. The email will contain the message you posted to his profile. He can then approve it (so it will appear on his profile) or delete it. If he approves it, you'll get an email back saying he has approved it, including a link to his profile to check out your comment.