The Employee Cubby is a feature that is available to all employees of Poppins, whether they are current or previous employees.
It gives your employees a way to access their paystubs and W2s.
You can invite your employee to set up the Cubby from your account under Settings -> Employee Info -> General Info. Once there you can click on "Invite [name] to set up Employee Cubby". This will send them a link via email that they can use to create the Cubby.