How can you alter the speed of the clips?

Is there a way to ramp up the speed of a clip?  For example, my son wants to do some unboxing videos, and during the actual opening of the shipping box, and removal of the item, we want to speed that portion of a clip up 2x speed (or more).  I don't see any way to do this within Rush.  I could just be missing something. 

Any help?