Hello there, Jena11.

In QuickBooks Desktop, you have two options to write off bad debt either use journal entry or the Receive Payments feature. From the Receive Payments section, select the Discounts and credits to close out the unpaid invoices. Both ways have the same effect on your book. 

If you need further information about it, please consider checking this article: Learn what to do if you can’t collect money from a customer and need to write it off as bad debt in.... Also, if you need further help when handling your accounts in the future, you can reach out to your accountant to ensure everything will go properly within your company file.

Additionally, you here for more  details when recording journal entries in QuickBooks Desktop Windows.

Please visit here again if you have other concerns. The Community is here to help you anytime. Take care and stay safe.