Go to your "Behind the Scenes" and choose "Email"; at your Inbox, at the top you'll see a tab that says "Block List" click on that and add the name - Good luck!
Unfortunately, there is no way to block them that I am aware of. You just have to delete the comments. However, let me know if you need Admin to investigate further.
I had that problem - and the only cure I found was to keep deleting their comments - I think they finally gave up. You could - of course - send them a PM and ask them to stop - politely. although that might not work either. rd
you can block a users mail but that's it. however if you contact abbie, she will slap the person about. just copy what they are saying to you and they should get a warning. if it happens a few times - they get kicked from the site.