Moving a part to a different part of the plane

How do I select an entire part to move it out of the way… I created a part (on the top plane), created a mirror of the part, then wanted to enlarge the original part, but it now overlaps the mirrored part.. I just want to move part 1 over to allow the enlargement. I see that a "triad" is supposed to show up but none does when I select the part.