How do you operate a water pump for a caravan?

I have an elddis mistral but I cannot seem to work the water pump as I am new to all this and need help if anyone could help it would be great.How do you operate a water pump for a caravan?Should work as you turn on the tap.How do you operate a water pump for a caravan?it should come on with the water pressure when the taps are opened providing the power is connectedHow do you operate a water pump for a caravan?if you just got van check water turned on at mains