Go to the BigCommerce homepage.
Enter a store name in the field labeled Create your store name, then click Start my free trial now.
Your store name can be changed at any time after starting your trial.
Once your trial is created you'll be prompted to log in for the first time.
You can now use your trial store and new account to get started with the Stencil frontend framework or begin building an OAuth app.
When you login to the Developer Portal to get OAuth credentials for the first time, you'll be prompted to authorize the Developer Portal application.