To increase or decrease the monthly rent charge, edit the tenant (Tenants tab > right-click tenant > choose Edit Tenant).
In the Accounting Defaults section of the edit window, click the edit button (the pencil and paper icon), and adjust the dollar amount accordingly.
All future rent charges will be based upon the new amount entered.
Adjusting the tenant's monthly rent amount on this screen will automatically update their ongoing recurring rent charges. This will not update any rent charge transactions that have already been posted to the tenant's ledger.
Any transactions that have already been posted would need to be edited manually. See: http://support.rentecdirect.com/knowledgebase/articles/194459-edit-correct-or-delete-transactions