HP PHOTOSMART 7900 - Manual (Page 11)

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5 If you are replacing a print cartridge, slide the old print cartridge out and
store, recycle, or discard it.
Note: For information about recycling print cartridges, go to www.hp.com/
recycle.
6 If you are installing a new print cartridge, take it out of its package. If you
are replacing a cartridge that has been stored, remove it from the print
cartridge protector.
7 If you are installing a new print cartridge, grasp the pink tab and gently
peel off the plastic tape. Make sure you remove only the plastic tape. Be
sure to install the print cartridge immediately after removing the tape; ink
nozzles exposed longer than one minute may dry out and cause printing
problems later. Once the tape is removed, do not attempt to replace it.
Caution! Do not touch the ink nozzles or the copper contacts on the print
cartridge. Touching these parts may cause the print cartridge to fail.