HOW to delete domain??

I want to delete my free domain, because I dont want to use it any more.
How can I do that? :?:
This is for Reduce bad site. thank you!!

Domains are normally registered yearly, but subdomains such as yourname.bizhat.com can be deleted instantly, you can talk to some one other than me on the www.netfreehost.com / contacts page.

Thank yo my friend.
For your help

is it against the rules to delete the domain, becuase the password went in my bulk folder, i deleted it, and thus, life sucks. I want to delete it, but then remake it. is that against the rules?