State tax filing

But it says this right below "Example 2":

 

In these cases, you need to file a nonresident return to recover the erroneous withholdings. On the nonresident return, declare earnings of $0 so you can get a full refund for the taxes your employer withheld. You should also tell your payroll department so they fix this in the future.

 

How do I do this???  (FYI, I no longer work for the employer)