If you sign up at some site it should be implied that you agree to the rules. Of course you can break them once or twice but it will result in a warning, edited post or a ban.
I doubt you thought that adding a "_" in front of the url would make it OK.
And since we already had the subject covered in the url I posted above which I can only guess you were already aware of you had no reason to post url to another site at least not in this case.
And it is not first time you posted url to the same site.
We are glad to help other sites if they are starting up and need some promotion like in this thread:
http://www.sat-universe.com/showthread.php?p=290874
No reciprocal link is required to be included there.
Most of the big boards have the same rule about no links and don't need our help. People can find them by googling or being referred by a friend.
And please restrain yourself from using profanities.
You're welcome to help people here if that is really what you want to do but within the rules of this site.