Use the bracket screws provided to secure the brackets at the top of the dishwasher to the underside of the wood countertop.

If desired, the dishwasher can also be secured to the cabinet frame using the instructions which follow.
Remove the 2 plastic caps from the mounting bracket access holes.

Drive a wood screw through the mounting bracket and into the cabinet frame.

Reinstall the plastic caps.
If your model shipped with a sound insulation sheet, follow the instructions provided to install the sheet now. But wait to install the insulation pad and lower cover until after the final installation check.