Here's how to Reactivate your iPad Register after deactivating it.
Go to your BackOffice > Settings > iPad Register > Confirm you see the Register you want to use is 'Deactivated'.
If it's not, simply click into the register and choose Deactivate.
On your StoreHub iPad app, tap 'Activate Your Register'.
Enter your credentials when prompted (Store Name, Email and Password). Then tap 'Activate the Register'.
Enter Employee PIN.
In your BackOffice, go to Employees > Manage Employees > Select an employee. Look for the employee PIN.