Kyocera FS-C1020MFP - Manual (Page 437)

Slide both green levers on the front cover.
Holding the green tabs on both ends of the transfer unit, tilt it backwards then lift it up.
Hold the center of the waste toner bottle, and then carefully pull it partially out without
tilting it.
Pull the waste toner bottle halfway out, grab the bottle firmly, and then pull it straight
out.