My b2evolution Version: 3.3.3

I been getting a lot of spam net related to any of my posts from my blog.

I was looking for an option for users wanted to leave a comment. That's it's required for them to login and register. That way I can ban them. Or does any one have any ideas on keeping these jerks off my blog.

Last night I had over 22 comments related to spam. I had to delete every one. There has to be a better way then this

Joe