HelloCustomer your waterpump is located on the front of the engine towards the front of the vehicle. Below is the procedure. It is a relatively easy job as far as waterpump go.
Your JA Expert,
Water Pump Replacement Removal Procedure
There is one belt tensioner that is spring loaded, and you will need to slacken. Slip the belt off of the waterpump and you can leave the belt in place everywhere else. Just move it so it doesn't get coolant on it. Make sure the car has a belt routing diagram on it. If not draw one so you don't run into any unexpected issues when reinstalling the belt.
Last question where is the belt slacker at? got a diagram?
Yes, I certainly do, here is a picture that should help