Try signing up at https://www.cloudflare.com/ and then logging in through cPanel?
That's the best I can do. It's already activated on my account. The Help guide is available here.
Try disabling any ad-blockers. If you are still having this issue, reply with the server you are on xo#.x10hosting.com and see if others report the same issue.
But wont let me press it if i dont accept the Terms and Conditions.