fetching graphics for slideshow

I have only recently changed my theme to a WPMU Nelo from one by another author and am adding a slideshow. I already have the images I want to use in my WP media library, but can't figure out how to connect them with the new slideshow. All the avenues I have tried take me to my own computer for choosing. The trouble is, I am on the road and don't have those images on the laptop.

Is there a way to choose images from my WP media library?