To create an invoice directly from a job, navigate to the job then click the Make Invoice button below the grid.
This will create the then open the new Invoice. In the invoice form edit the details as required. You can then email or print the invoice as required.
If using the MYOB Integration feature of M-Power then you need to ensure that each line in the grid has a MYOB Item code selected. If all lines do not have an Item Code selected the export will fail.