Let me first say that I highly do not recommend this, lol. I can only send you in the right direction, I won't really be able to help you after this.
You need to first root ("jailbreaking" for android) your galaxy tab and install CWM Recovery for your device.
Here is a video tutorial for that.
Now what you're doing is installing a custom ROM.
Here's a step by step tutorial on how to do that. You install the file Kindle ROM here, or any other ROM (there are so many - some are much better than the Android that came with your device).
The ROM you want is (I believe?) the one on the page you posted,
here. I have never heard of someone trying this IRL so I don't know the consequences here.
If ever you fail,
here is the tutorial to send you back to stock android for the GT2.
Good luck!