Can you please be more specific with what you're trying to do?
There are a number of tools for mixing video and audio in Premiere Elements, including a tool for pacing picture changes in a slideshow with the beat of the music in a song.
Meantime, have a look at my free Basic Training with Premiere Elements tutorials at Muvipix.com, a site full of tips, tutorials and media for videomakers.
I've also written a number of books on the various versions of the program that can help you get up and running.
As Steve mentions, there are several tools, that can be utilized. For establishing the pacing of the visuals to the music, I like the asterisk key on the number keypad (NumLock ON). Just tap it, as you listen to the music, to place Marker on the beats. You can tweak these (Click-drag), if necessary. Then, just adjust the Duration of each image/Video, to those Markers.