How to Connect My CloudFlare Domain with Hosting

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I've purchased a domain for start my newly blog so I registered my domain on CloudFlare. But after purchasing hosting I checked on CloudFlare that THEY DON'T ALLOW CUSTOM NAME SERVER UPDATION. menas I can't update my nameserver on my cloudflare domain control panel. Although they allow to change other DNS management service e.g. A Record, CNAME, MX Record etc. (Means I can create A Record, CNAME, MX record etc.) but can't update my custom nameserver.

SO HOW TO CONNECT MY DOMAIN WITH MY HOSTING SERVER ... PLEASE GUIDE OR REPLY WITH STEP BY STEP ANSER ... BECAUSE I'M NOT TECHNICAL PERSON.