To find it visually:
1. Open the hood.
2. Locate the serpentine belt. The water pump is usually one of the pulleys the belt drives.
3. Look for a housing with hoses connected to it. These hoses will be the inlet and outlet for the coolant. The pump itself will be behind this housing.
It's generally near the timing belt (or timing chain depending on the engine), although you shouldn't need to see the timing components themselves to find the water pump.
If you are not comfortable working on your car's engine, it is strongly recommended to take it to a qualified mechanic. Working on the cooling system can involve hot coolant and pressurized components, posing risks if not handled correctly.