How do I write off bad debt?

I have someone that never paid off their balance last year and we want to write off the bad debt.

Reservation is left with balance (Guest left without paying):
From the Reservation’s Guest Folio, press Sale.
Select the Product Group – Reservation Products and select the Product Label – Unit Type of the reservation.
Enter a ‘-‘ negative charge to equal the outstanding balance, press Post.
Select the Payment Type – Guest Folio Transfer, press Post and Submit to finalise.

This will post a credit to the reservation and the balance will now be $0.00, allowing the reservation to be checked out.

Accounts Receivable:
Click Account from the Menu Bar, and select the required AR Account from the AR Aging Review panel.
Press Account to open the account. Print a Statement with the balance owed. This will need to go to your Accountant at the end of the financial year as tax has been reported in your monthly reports, for this outstanding amount.
Press Sale and select the Product Group – Reservation Products and select the Product Label – Unit Type of the reservation.
Enter a ‘-‘ negative charge to equal the outstanding balance, press Post.
Select the Payment Type – AR Transfer, press Post and Submit to finalise.

This will post a credit to the AR Account and the balance will be now $0.00.