Hank here from Shopify.
That is great to hear you have resolved the issue with purchasing a domain. I will just list the most common issue when it comes to purchasing a domain for future reference. When it asks to edit the store information, this is to confirm the details within Settings > General of your admin.
It is normally things like ensuring your store address (including the street number for example) is correct, and that the area or international code is correct for the phone number you have on file.
We also strongly advise that you do not have any "special characters" within the store name information, as domains do not recognize these, and they can lead to issues when verifying the domain.
But great work getting this resolved, but do reach out if you need any further assistance!
All the best,