I imported a .stl but it's free floating in space. I'm struggling to align it with any of the global axis.

Greetings,

 

I'm currently working on a project for a college class. It's a docking station for a TI-Nspire calculator. The object is a 3D scan of the calculator and when I imported it into SW it was not aligned to anything. I've created some surfaces from meshes but I can't figure out how to align it. I'm an SW rookie. Help is appreciated!