When I try to use it it beeps and I don't know what button to press
The Dowsing Machine does the searching for you.
There are two pointers.
The direction that the two pointers want you to walk towards will be the direction they're facing with the arrows.
lf they start to beep with a circle in the center, you are standing ON the item, so move one space over, and get it.
lf there's anything you really don't get, please comment.
Hope you find tons of stuff! ~