If you just signed up for Shopify or haven't finished setting up your storefront yet, you may still have a password-protected storefront. You'll need to share this password with anyone you want to access your storefront.

Note: This is the random and automatically generated (by Shopify) password to your storefront only, not your email/password to log in to your Shopify backend dashboard.

The storefront password can be found in your Shopify backend, under Online Store -> Preferences and scrolling down to the Password Protection section.