To install, just flex it a bit to make the rubber a bit more supple, and drop it it - it's as easy as that! Just pop it out for cleaning, it's even safe in the top rack of your dishwasher! Only compatible with the second generation Center consoles (if you have a sliding door, you have a second-gen console).
Please refer to the video below, which covers the cupholder stabilizers, and cupholder inserts. Both are incredibly easy to installed, just drop them in! Be sure to flex the cupholder insert around before installing, that'll ensure it stays in place.