What they’ve all said. A new machine is likely cold water feed only. Check the machine instructions.
Leave the machine out from the wall so you can check for drips/leaks.
Connect one end of the hose to the back of machine. Use any washer or filter supplied.
Connect the hose from the machine to the supply pipe with the blue tap. Use the rubber washer which should be supplied and hand tight is sufficient. You don’t need a wrench.
Switch the cold feed on. This should only need about one eighth turn. You will hear the water flowing into the machine.
Wrap some bog roll or kitchen towel around the supply pipe/hose connection and machine connection. This will show up any leaks.
Run a short cold water cycle. Keep an eye on it, checking for leaks.
If it’s all okay, move the machine into position, being careful not to snag or pull the hose.
If it does leak, switch off the water and run a spin/drain program to get rid of the water.
Disconnect the hose and try again.