But Why?
You are using a browser, program, utility, etc. that cannot pass CloudFlare's browser challenge. This may be because you're using an old browser, have javascript disabled, using some sort of scraping program, or who knows. I don't know what you're doing, but CloudFlare doesn't like it.
Unban me?
Whatever it was that you were doing, stop it. Now wait 3 hours and the ban will clear automatically.