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Position the base system beneath the faucet. Twist on the mounting collar. Insert the filter cartridge into the filter cup. Check the cartridge. Flush out the new cartridge.
Hold the base system beneath the faucet with the filter cup portion sitting to the left side of the faucet.   This means that the Filter Replacement Indicator should be facing you. Note that these instructions are the same regardless of whether or not you used an adapter. If you used an adapter, the filtration system will be mounted to the adapter instead of the faucet itself, but the steps are otherwise identical. Hold the base system steady with one hand. Use your other hand to rotate the mounting collar at the top of the base system, twisting it onto the faucet or adapter until it feels snug.  Tighten the mounting collar by hand. Do not use pliers since doing so could damage the threading. If you have trouble twisting the mounting collar in place, rotate the body of the base system back and forth while tightening the mounting collar. This may allow you to tighten the collar further. The mounting collar should be snug, but avoid over-tightening it since doing so could cause damage. Hold the filter cartridge over the filter cup on the base system. Push the cartridge down until it clicks into place.  You should support the bottom of the base system with one hand as you insert the cartridge with your other hand. The insert groove near the bottom of the cartridge should line up with the filter replacement indicator and the front of the base system. Do not force the cartridge into the filter cup. If it does not glide into the cup smoothly, reposition it and try again. Tug on the cartridge, gently pulling it up, to verify that it has been engaged in the system. Once the filter cartridge has been engaged, the filter replacement indicator should reset itself and turn on. You should see a green flashing light. Move the filter handle toward you to activate the filtered water setting. Turn on your faucet and run cool water through it for five minutes.  Only use cold to warm water. Do not use hot water. Flushing out the cartridge removes excess carbon dust and activates the filter. Do not be alarmed if you see carbon dust appear; this is normal.