Replace upper spray arm, Frigidare dishwasher

Dishwasher Repair
1

The upper spray arm of my Frigidare dishwasher fell off. How do I repair it? Do I need to replace the part or a component?

2

Here are your parts.
Parts for Frigidaire PLD4375RFC0 Dishwasher - AppliancePartsPros.com

I cannot say if you need to replace a part.
It should just screw back on.

I would check that all the hole in it are clear before re-attaching it.

Note that if you look up a part and click on either it’s description or picture a new page will open often with more info about that part.