You will need to use one of the screen designers available for Mach, I use Screen4 but others seem to prefer MachScreen. You should be able to find them both on the Mach downloads page.
Adding DROs in Screen4 is simple enough, just click on the icon for DRO on left pane then click on the screen where you roughly want it. Then it is important to click the None Icon or you may inadvertantly add more DROs.
Once you have your DRO on screen then you can double click it and you will then be able to choose its function from the drop down box or alternatively you could add the oem code for it which you will find in the list in the sticky at the top of the forum or on the wiki.
Adding jog buttons is a similar procedure.
Once you have done what you want then save as and call it something unique, that way if you upgrade Mach it will not get overwritten. Lastly load your altered screenset from within Mach from the View menu.
Hood