@louwho , Cindy, To position drip tray, one side of the base has a slot provided for the driptray. Slide the drip tray into the base according to the instruction on the tray. I notices on one model of grille I had, I had to raise the front up a bit(sat the front feet on a couple metal bottle caps) so it had more tilt to the back for it to run the grease off correctly. Below is a link to your manual. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
http://www.cuisinart.com/share/pdf/manuals/gr-4n.pdf