Can't Use Uv editor

Hi! I Can’t seem to use the Uv Editor on this model, Please Help! :frowning:

Os: (Mac version 10.7.5 Blender version 2.71)

https://dl.dropboxusercontent.com/u/247410143/spaceship.blend

Hi! I Can’t seem to use the Uv Editor on this model,
In what way ?

You need to apply seams to your model to enable a 3d objects to be flattened or use the Smart Unwrap option