Click on System, then Support Desk, then at the bottom under Frequently Asked Questions there is Reporting RMT Advertisements, click on that, then on the button at the bottom "File Report", copy paste the RMT tell you got. Send...done and dusted. If you put that person on your blacklist, you will get a message from support saying that you can delete it (usually within 5-10 mins). Result = nice empty blacklist.