On the Invoice Batches form, update the description if you wish. This is the only field that can be updated. The other fields can either only be edited when creating a new record, or they are fields that are read-only.
On the Invoice Batches form, select a record and delete it. You can only delete an invoice batch if it has not yet been printed. When you delete an invoice batch, all A/R posted records assigned to the invoice batch are released.