If you already have an account at cloudflare, there are two ways you can benefit
1 - If your email account for dediserve, mathces that at cloudflare, simply add cloudflare to your dediserve account and your cloudflare and dediserve accounts will be linked.
2 - If the cloudflare login is different, open a ticket with CloudFlare and simply ask them to link you to dediserve
Once done, you can enable Railgun on your sites for free!