After a lease has been activated you can still edit some of its information, such as prices, deposit amounts, tenants in lease etc.
In order to edit an active lease term press Views -> Lease Terms -> Current to navigate to an active lease term, and then Versioning -> Edit Draft to edit it.
Once you make all the necessary changes you can save the form, then press Versioning -> Finalize to apply the changes. Please note that all the financial changes are not immediate. They will be included in the next bill.
Click on the lease ID or on the link at the top of the page to go back to the lease.