At Strapi, a user is someone who has access to the Strapi Admin Panel. If you want to add a user to your Strapi account, you can easily do it from the Customer Portal by clicking here.
1 - Access your account with your email address. You'll receive an email with a password to access your account.
2 - Select the project you want to add users to
3 - Edit your subscription
4 - Add users to your account and update your subscription
If you're having any trouble with any of the previous steps, please contact us at email@example.com mentioning "Add users".