How can I define the pcb dimension using Eagle

Good night, I’m designing a little board that is smaller than the 5cmx5cm smaller pcb service that Seeed as to offer, but I dont know in which layer do I define the board size, so the pcb’s have their designed size and not the full 5cmx5cm size.
Any help?


Sorry for the late reply.

You do not need to define the pcb dimension. Just submit your gerber file to seeedstudio.