Davinci Jr. Re-Center Bed

Sorry if this has been asked before. Just finally tried to utilize most of my bed and it seems it's not centered. prints go off the edges.

My printer seems to print the proper scale, but I can't print larger prints because of this offset.

It's off by about 1-1.5 centimeters in BOTH the X and the Y axis. can someone point me to a resource or explain how to reset the printer's center.