In order to configure the NameServers of your domain name registered on Namecheap.com, please follow these steps

1. Login to your account and navigate to your Dashboard.
2. Click on 'Domain List'
   
   
   
3. Click on the 'Manage' button for your new domain name
   
   
   
4. Scroll to the 'Nameservers' section (Under the 'Domain' tab) and set the dropdown to 'Custom DNS'
   
   Set the Nameserves to ns1.storemantis.com and ns2.storemantis.com . Save your changes once done