Follow these steps to set up your subdomain in Namecheap.
Since you are using a subdomain, your custom domain will look like
https://schedule.yourbusiness.com
.Log in to your Namecheap account and go to Domain List
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Click on the Manage button for your domain in the list.
Go to Advanced DNS section.
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Click on ADD NEW RECORD button.
Select CNAME Record as the Type.
Fill in the Name, Target and TTL fields as seen on the custom domain setting page on NeetoKB.
Click the ✅ button to save the changes.
For more information, refer to the official documentation.