Your engine cannot run without coolant and this is something everyone can do. Every engine is different but if you check your manual you should find where the coolant reservoir is. It will normally be bolted to one side of the engine bay or the other, and be a white semi-transparent bottle. Wait until your engine is cool and take a look at it – the outside should have ‘low’ and ‘high’ markings on it and the level of coolant inside should be between the two.
Do not take the radiator cap off to check coolant levels. If the coolant system is still hot then it is still under pressure and the pressure release will burn you.