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1.take new toner from kit.

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2.remove its cap.

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3.open the front door of printer.

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4.pull green coloured square shaped part in outward direction..

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5.after upward pulling of that upper green part,press lower green part showing in picture. 

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6.pull gently this green part outward so that old toner will appear. Gently rotate it outward(anti-clockwise) and take old toner out. then replace new toner and rotate it inward(clockwise) and fix it. 

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7 push this whole part inside.

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8.close the cap of printer.