Select User pools on the left menu.
Select Email
Select Custom for Password policy pattern to customize the password as you want
Scroll down, select No MFA for Multi-factor authentication pattern
Leave the options as default
Scroll down, click Next
Select Send email with Cognito
Enter user pool name, such as: cognito-fcj-book-shop
Select Public client
fcj-book-shop
Expand the Advanced app client settings pattern
Scroll down to bottom and click Next
Click on the user pool you just created
Click the App integration
Scroll down to the bottom, record the Client ID