I activated Domain and/or Mail Forwarding service, how come it does not work?

Same with Managed DNS service, you will also need to change your domain's nameservers to the...

 I have FREE Managed DNS service for my domain, how come it's not working? I can not access the entries I have created.

Please make sure the domain’s nameservers are:

 What is CloudFlare? How Do I Enable It in cPanel?