Since you are using a subdomain, your custom domain will look like
https://schedule.yourbusiness.com.Log in to your Cloudflare account and select your domain.
Go to DNS.
Click on Record.
Click on Add record.
Select CNAME as the Type.
Fill in the Name, Target and TTL fields as seen on the custom domain setting page on NeetoCal.
Disable Proxy status.
Click Save.
For more information, refer to official documentation.
