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Summary: When refilling an HP 93 ink cartridge, first remove the sticker that has been placed on it by the manufacturer. Avoid overfilling the HP 93 ink cartridge with help from an employee of an ink-filling station in this free video on HP printer cartridges.
"Hi this is Taylor here to explain how to refill an HP ninety-three cartridge. Refilling an HP ninety-three cartridge is fairly easy. What you need to do is first remove the sticker placed by on there by the manufacturer, don't worry if you tear it half they can be pieced together. Once the HP ninety-three sticker has been removed, you can see that there are five holes, the top one is designated for the yellow, these two over here are for the magenta, and these two over here are for the cyan. Each one on the side it does not matter which one you fill it goes into the same reservoir. You can insert a needle full of of ink these particular cartridge will only take about one and a half to two and a half milliliters of ink, be careful not to overfill them because they will leak everywhere and give you a big mess."
eHow Article: How to Refill an HP 93 Ink Cartridge