Top sprayer fell of kenmore ultra wash dishwasher. How does it go back on?

There should be a little screw and cap holder that you put this back on with it would probley be in the bottom of your dishwaser if it ran a cycle when it fell off then it also could have melted and you can call the parts dept of the company to buy the pices for it very easy to fix but I would make sure that it is not in there as when you run your dishwaser it will get down in the grinder that grinds up all food and stuff and will ruin your dishwaser