To create an account(s) on any Shopify site, simply choose a Shopify site from the drop down menu. Choose Custom if you want to create accounts on a Custom Shopify site.
You can insert your catchall domain to create accounts to a specific domain. You can also just enter @gmail.com or any other general email domain. Note: This does not create the email account only the account on the selected shopify site. You can also use proxies to create account(s), you can save your proxies in the settings tab of the application.
Once the accounts are successfully created, you can choose which folder to export the accounts to. It will export in a .txt file in an email:password format.