Go to your admin panel==>click on "Ban Control"==>you will see a heading "Un-ban one or more IP addresses." Select the ip address - highlite it and click on submit at the bottom of the page.

This is the normal way to unban someone. If BizHat has a built in spam ban tool you may not be able to do it. I can't open my board for new members because I get dozens of spam profiles posted with pornography, drugs and gambling, and as a result my forum has died.

Bizhat seems too busy with their new-found advertising ventures to deal with problems in their free forums section. I asked one of their moderators a question and got that as an answer: "Forum is a free service by Bizhat. Our team is busy with some more important projects, so it will take some time for providing solution to moving your posts from our forum"