There should be a wide slot in the bottom of the calculator. In the slot is a black plastic tab. Pinch the tab and pull it straight out and you'll be holding a PR-72 ink roller. Push a new one in the same way, and it will snap into place.
As the warning says, don't try to add ink to an old roller. Excess ink will gum up your printer.
PR-72 is a Porelon product number, from page 5 of
this catalog. Other manufacturers make the same roller and give it a similar name: NR72, IR-72, something like that.
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