Make sure you've switched the electricity switch to the on position
I installed my bosch (tabletop) dishwasher msyelf.
There is the water inlet. This will usually look like a rubber hose- If you can see where that hose goes from the back of the dishwasher, it should go into a water pipe (usually under the sink, but may not be) - May look
like this This water inlet needs to be turned to on for the water to flow into the dishwasher. The only other bit was the the outlet hose, which should go to the drain. The dishwasher only needs water in and a way to get out. It will do everything else, self contained.
The other thing I have found, is sometimes, especially if its a built in dishwasher, you have to push quite hard down on the buttons to get it to go (in my experience)
If you can't figure it, ask the landlord or letting agent.
Good luck!