Using cloudfare when domain is not pointed to hosting provider

I havent pointed my hosting provider to my domain name and im using a the host file on my computer whilst I develop me websites.

Because of this i’m getting the following error message from Cloudfare within my hosting providers interface:

DNS check failed

For Cloudflare to work properly, WWW has to be configured as a CNAME that points to the domain’s Cloudflare address. To do this, add the following lines to your DNS zone:

www IN CNAME www.rewiredbristol.co.uk.cdn.cloudflare.net

cloudflare-resolve-to IN CNAME rewiredbristol.co.uk

Can I do that myself in my cpanel by adding the CNAME records as above?