To add a fee, go to "Properties" in your NestEgg account and click on the unit where you would like the fee to be added. Next, select "Rent and Fees". From there, you can scroll down to select, "add a fee". You'll be able to name the fee, add an amount, and select a frequency. Please note that you will not be able to automatically trigger any fees, such as late fees. Instead, you will need to add the fee manually if the action leading to the fee(such as late rent) occurs.