Samsung SF-555P - Manual (Page 141)

6.8 Maintenance
2. Remove the old toner cartridge. Follow the instructions printed on the
cartridge box to recycle the used cartridge.
3. Unpack a new toner cartridge from its plastic bag, and then remove
the paper rolled the cartridge.
Take the following steps to replace the toner cartridge:
1. Pulling the cover release buttons toward you, open the cover.