Yes, you can! To add users to your Printful account, go to your account settings → Users. There are two roles that you can assign to new users: Admin or User. Admins have access to everything, while Users can’t use Billing and Reports sections, add/remove other users, change user roles, or remove stores.
All Admins can change the roles anytime in the account settings.
Just remember that it’s possible to have access to only one Printful account per email. So if the person you want to add to your account already has access to another Printful account, they need to use a different email address to be added to your account.