From the main menu, Click on right pane icon and choose lease menu.
Choose the lease that you wish Edit a Move-In date.
Now you are in lease, On the top of lease page there you could see Edit button.
Under the Move-In Information section click on Move In Date field and pick the date from the calendar.
At the bottom you could see the Update Changes button just click on that for save the changes.
Note: 1. You cannot edit the move-in date for the moved out lease.
Note: 2. While editing the back dated move-in date make sure the unit is vacant on that date.
Note: 3. You cannot able to edit the move-in date for the merged Invoices.