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There are videos on YouTube that show how to fill the coolant.

Here are the instructions from the 2014 Cruze service manual for cars made in the USA. It may not be the same for your car.

Fill Procedure:
1- close the radiator drain plug.
2- lower the vehicle
3- vehicle should be level
4- Loosen the vent screw on the radiator

(vent screw is located at the top, right (passenger) side of the radiator)

NOTE: Close vent screw when coolant begins to flow from the vent screw.

5- Add a mixture of 50/50 DEX-COOL antifreeze and clean drinkable water to the bottom line of the bleed nozzle on the coolant surge tank. When the coolant level stabilizes, add enough coolant to reach the bottom line of the down pipe hole.
6- Start the engine. After the engine starts, verify that the coolant level reaches the bottom line of the down pipe hole.
7- Install the surge tank cap
8- warm up the engine. Run at 2,500 RPM until the engine cooling fan turns ON.

Note: If the heater core has been replaced, let the engine run for 2 minutes at 2,000-2,500 RPM. This ensures complete venting of the cooling system.

9- Turn the engine OFF and allow the engine to cool down.
10- Remove the surge tank cap.
11- Check the coolant level and fill to the COLD mark if necessary.
12- Inspect the concentration of the engine coolant, using GE-26568 tester.
13- Rinse away any excess coolant from the engine and engine compartment.

NOTE: After a test drive let the engine cool down and check the coolant level again. Adjust the coolant level to the COLD mark if necessary.
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