Some prepositional phrases modify a noun. Look at these examples:
That book on the desk is mine. The phrase on the desk modifies book.
Eat the cherries in the bowl for lunch. The phrase in the bowl modifies cherries.
The bird on the roof is singing. The phrase on the roof modifies bird.
The boy with red hair is my brother. The phrase with red hair modifies boy.
Use a prepositional phrase to modify a noun.
It’s your turn. Find the prepositional phrase in this sentence that modifies a noun. Three ladies with dogs got into the elevator. Did you figure out which phrase modifies ladies? Good for you.