gowebstatic.tk is a “human readable” format instead of your IP-address. So the DNS-server translates “gowebstatic.tk” to IP-address 126.96.36.199. If you already have a DNS-host you can redirect it to your new Go server IP-address. If you not have a domain, you must buy a domain. Or chose a free domain (gowebstatic.tk is a free domain). There are hundreds of domain companies out there. Chose one that suits you best.
The process of redirect your domain to your IP-address may differ depending on your vendor.