If you're looking to find your domain on Shopify, there are a few things you can do.
First, you can try going to your Shopify settings and clicking on the "Domains" tab. From there, you should be able to see a list of all the domains associated with your Shopify account.
Alternatively, you can try logging into your Shopify account and then going to the "My store" tab. From there, you should be able to click on the "Domains" tab and see a list of all the domains associated with your account.
If you still can't find your domain, you can try contacting Shopify support and they should be able to help you out.