Custom Domain Features are available only on the supported plan. 

Check Plan details

Procedure

• Create an account in Cloudflare (Free Plan) and add your main domain. (yourdomain.com and not yourdomain.foodomaa.com)
• Log in to your Domain Registrar.
  (Domain Registrar is the entity through which you have purchased your domain Example: GoDaddy, NameCheap, Hostinger, BigRock, etc)
• Go to the DNS Settings/DNS Manager on your Domain Registrar Dashboard.
• Remove your current NameServers and add the Nameservers that are provided by Cloudflare.
   (Domain Propagation may take 24 hours, but generally happens within a couple of hours)
   (Cloudflare will notify you that your domain has been linked successfully)

(Skip Steps: 1, 2, 3, and 4 if your main domain is already connected to Cloudflare)

• Now, go to Admin > Settings > All Settings > Custom Domain
  (This should be your main domain, make sure to enter this domain correctly)
• You will be provided with the Records that need to be added to Cloudflare DNS Page.
  There will be 3 Records:
  Two TXTRecords, and one CNAME Record
  Add these records as shown on the Foodomaa Custom Domain page.
• If the records are added successfully to Cloudflare, Foodomaa will automatically verify all the configs and your main domain will be ready to be linked. (Generally takes 2-5 minutes, this might take 24-48hrs in some cases)

After this, your custom domain will be connected successfully.

Please note that there will be a fixed fee of $5 for each time the custom domain is changed after it has been set.