Take the new dishwasher out of the box and lay it face down so the back is visible.
Verify that all of the connections are there.
Take the cap off the drain line connection at the dishwasher.
Note: Don't be alarmed if water comes out, each unit is tested at the factory before it's shipped.
Attach the drain line to the dishwasher.
Attach the dishwasher supply line to the 'dishwasher 90', then tighten with a wrench.
Note: New dishwashers will include all the parts you need to install with the exception of the 'dishwasher 90'. You'll need to purchase this at your local home improvement store.