To Create User Accounts, please follow the following settings:-
1) Login to Plesk control panel.
2) Click on "Users Tab".
3) Click on "User Roles Tab" and then Click on "Create User Role"
4) Enter the "Required detail"
*Assign a User role : User roles grant users administrative privileges and access to applications that you selected for the role.
*Access to subscriptions : Allow users to access only a specified subscription. The "All" value grants them access to all subscriptions within your hosting account.
5) Click Ok.
Information: The user account Account Name was created.
