Olivia here from the Shopify Team. I'd be happy to help you out with this.
I looked into the domain name you would like to use, and I can see it has been registered since April 2020 via the domain provider http://www.internetbs.net. I assume you currently own this domain?
If so, you can easily point it to your Shopify store to start using it. Follow this step-by-step guide on connecting a third-party domain.
Log in to the account that you have with your third-party domain provider.
Find your DNS settings, domain management area, DNS configuration, or similar.
Edit your A record to point to Shopify's IP address
www CNAME record to point to
Voila! That should do the trick, but let me know if you have further questions or comments.