Hi Mayu. MSN communities have been experiencing a heavy SPAM campaign. Without vigilance, the forum would be filled with as much advertisement as content. We have a section, called member links, where you are free to leave a link for a g-rated, non commercial site. Because of the extent of the problem a member joining to post a link to their site on the forum is unjoined. I think that is what happened to you.
Welcome to the group. Feel free to place your link in the member links section. We hope you enjoy your stay here and look forward to getting to know you here on the forum.