Changing Blog Address

I'm trying to decide whether it's better to simply change the blog address or actually investigate the individual/s who are penetrating this blog. I know the person/people involved are students at Valley Park so it won't be that difficult to track them down. It sure would be a shame to have a student expelled in the last month of school. It's amazing what the police can track down. We once had a student writing bad things about another student while claiming to be someone else. They were charged with uttering and expelled from VP.
Yemaan...I know you didn't write the comment so don't worry.
Ms. Galli