Open the front cover of the copier. Raise the green lever. Gently, pull out the toner holder. Push the toner bottle back, then, pull out the bottle Shake the new toner bottle six or seven times. Remove the cap of the toner bottle. Insert the toner on the holder, then, pull its top forward. Push the toner holder until you hear a click. Lower the toner holder lever into its original position. Close the front cover. Open the front cover of the copier. Open the rear cover of the copier. Check if the drum panel is open. Raise the green lever. Push the green lever. Push out the toner holder. You can now remove the drum unit.