Open a lease. For more information on how to do so, see section 4.6. or 6.1.
Go to the lease card (see image below).
Click the tab called "Dates" (see image below). Within the tab called "Dates" you will, among other things, find a field called "Alarm length latest termination date (months)".
Set an alarm length for the lease you are working with by entering an alarm length in the field "Alarm length latest termination date (months)"(see image below).