2005 ford freestar reset light on

Yes, you probably need to reset it. Make sure tires are properly aired up.
I have this reset procedure.
Key on engine off, Repeatedly press the reset button below the tach until the tire reset or similar message is displayed. Press the button for three seconds until the tpms icon flashes 3 times to confirm learned values have been erased, and the system is waiting to learn. Drive the vehicle for 20 minutes in mostly steady, straight line conditions in the following speed ranges.
25--42mph
42--62mph
over 62 mph
This procedure should be in your owners manual.

The same button that is pushed to reset your mileage is the same one to reset your Tire Pressure Light. Just gently cycle through till you see The Tire pressure reset and hold the button in until it resets.

It sounds like a low tire light check your tire pressure

Did you check the spare tire too?

if the pressures are ok, and the reset procedure does not fix it, it is likely that one of the sensors became damaged during the tire change. you should return to the service center that changed the tires and have them check it out.

before that, check that ALL FOUR of your tires are set to 35 psi. the system works on pressure differentials (not just low pressure) so make sure ALL the tires are set equally. also note that some systems may also have a sensor in the spare tire, and can cause the light to come on also. please check the door tag on your van to confirm what the pressures are supposed to be set at. good luck!

You need to put air in your tires. It's coming on because they are low.

I believe that one of your tires is low on air causing the pressure monitor to kick in. Check all your tires to make sure the inflated to the proper PSI which will be located on one of the door jambs

check air pressure in all tires and make sure its the same

Reset without message center:
To reset turn the ignition to the ON position, depress and Trip/odometer
button (located in the instrument cluster) until “TIRE RESET” or
“CHECK TIRE AND RESET” is displayed in the odometer display window.
Once “TIRE RESET” or “CHECK TIRE AND RESET” is displayed,
press and hold the button for three seconds. The low tire warning indicator light will flash three times
as the low tire warning system begins to initialize.

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Reset with message center:
To reset turn the ignition to the ON position, press the set up button on
the message center until “SYSTEM CHECK” is displayed. Press the
RESET button until “HOLD RESET TO RELEARN” is displayed, continue to hold the button for three
seconds. The low tire warning indicator light will flash three times as the low tire warning system begins to initialize.

It's also a good idea to reset the tire pressure sensors when you air up the tires. If I remember correctly, you click the odometer/trip meter switch until it flashes TIRE RESET (or something similar) then press the button and hold it for a few seconds. That way it sets itself to the pressure in the tires at the moment, and if it notices a pressure drop it puts up a warning.