** There is a big plug on your left side (Blue handle) , remove gently by your 2 fingers and add toner. it’s done.
** Another big plug below the blue handle is a ” Waste Toner box (Trash) ” , When it is full, You can empty the trash.
You DO NOT need to trash too often, it’s just when it’s full.
Type: Do it yourself
Category: (500g) ” DEDICATED “ Toner Refill + Reset Chip
Part No.: 45488801
No. of pages: Up to 18,000 pages at 5% Coverage
OKI Okidata B721dn, B731dn