Spray arm

The upper spray arm fell off. I have the arm and 2 plastic screw plug like things. How do I assemble it to replace it? Thanks

Here are your parts
Replacement parts for WHIRLPOOL KUDM01TJWH0 Undercounter Dishwasher | AppliancePartsPros.com

Un-clip the feed tube so you can pull it down a little.
Place a mounting pin (screw) in the mounting hole. I think it is the smaller one.
Place the spray arm on the feed tube, make sure the spray ho;les face down.
The other pin should then push into the other pin to hold the spray arm on.
Re-clip the feed tube.

You may need a new spray arm if the pins are broken.
It comes with the pins
AP3120022

Thanks, It all fit together, I hope it will hold for several more washings. If not, I have the part number and will order one. Thanks! Jaine