First open the tenants profile.

If the tenant has multiple units, click on the unit that you'd like to waive the late fee for.

Click the Menu Button.

Click the Late Fees Button.

Click the checkbox to the left to select the late fee you want to waive, and then click the checkbox to the right to waive the late fee. Put a comment in the comment box, and then save.

You've sucessfully waived the late fee.