Log in to your Namecheap account and go to your Domain List.
Click Manage next to your domain.
Select the Advanced DNS tab.
Scroll to the Host Records section and click Add New Record.
For Type, choose NS (Name Server).
In the Host field, enter your subdomain (e.g., blog).
In the Value field, enter one of the nameservers from the delegated service (e.g., ns1-06.azure-dns.com).
Repeat steps 4-7 for each nameserver provided by the other service.
Click the Save All Changes button.