Dell 3115 Color Laser User Manual page 445

Grasp the handles at both en he print cartridge that you want to replace and pull it out.
CAUTION: Since the used print ay spill some toner, do not shake it.
Installing a New Print C
Select the new print which color matches the color of the handles on the printer cartri e
replaced and shake it five or six times to distribute the toner ev
Remove the print cartridge from its packaging.