The following article will take you through the setting required, in WoCommerce, in order to be able to create orders in GRIN.
Step 1 Log in to your WooCommerce account.
Step 2 Click on WooCommerce from the side menu and select Settings.
Step 3 Click the Account & Privacy tab.
Step 4 In the Guest checkout section, select Allow customers to place orders without an account.
Step 5 Under 'Account creation', select When creating an account, automatically generate an account username for the customer based on their name, surname or email and When creating an account, automatically generate an account password.