You can point your domain to Namecheap by using these nameservers:
dns1.namecheaphosting.com
dns2.namecheaphosting.com
Copy the above-mentioned nameservers, and specify them in your domain's DNS zone.
Once you do that, DNS propagation will start. This process can take up to 24 hours. During this time, it's expected that your website won't work, but give it some time, and it will get online soon.
That’s it! Now you know how to point your domain to Namecheap 😊
NOTES
If your domain is pointed elsewhere by NS records, your DNS zone is also managed from there