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Open front cover and with a Philips screwdriver, remove screw that holds waste bottle cover closed. It is left to the Tray one. Pull out tray one. Open cover, to the left hand side of tray one. See the attached picture;
See this sample video --> https://www.youtube.com/watch?v=Ebruob4vWxI
The video is not for Savin MP C3002, but the procedure is same. The waster toner is usually located left to Tray one and you may need to remove the upper cover to remove the screw of waster toner door. So you can open it.