How do you change the distributor on a 2003 ford windstar?

There is no 'distributor' like in the old days... The function has been integrated into the coil-pack.

The coil-pack is secured by 4 small bolts - pretty straightforward to remove & replace - IF, you don't mess up the wiring sequence!

See "Related Questions" below for much more about firing orders, spark plug wires & coil-packs