I have just finish reading the included word document, and I can say that it is really helpful as it includes a step-by-step guide containing many screenshots; you would probably skip the chunk of text under "Sidejacking without Hamster" since it is a little advanced.
Just to summarize things up a bit, mostly similar to their readme.txt,
1. Install WinPcap.
2. Unzip the contents of sidejacking.zip to C:\sidejacking or anything simple
3. Hit Windows Key+R, run 'cmd' without the quotes
4. In the black box that appears, type in 'cd C:\sidejacking' and press Enter. The next line should start with the same folder name as well.
5. Type in 'ferret [dash]W' and Enter. If you get a packet.dll error, you would probably have forgotten about installing WinPcap
6. A list of connection interfaces should then appear. Remember the number that represents your wireless device.
7. Use a browser that you don't usually use, eg. IE. And configure its proxy options. Instructions for IE
here.
8. In the black box, type in "ferret.exe [dash]i [Number from Step 6]"
9. Type in 'start hamster' thereafter. If you see a 'hamster.txt: No such file or directory' error, it means you screwed up somewhere along, or my summary is missing something. Always believe in yourself first. =P
10. After setting up the proxy options at Step 7, go to 'http://hamster/'
11. You should see a list of IP addresses here. Click on one of them.
Extra, non-essential info:
I'm quite inexperienced in networking, but I suppose those are IP addresses which are only used within the network to identify users so that the router or whatever knows where should each data packet go to. This has nothing to do with cookies, btw.
12. Click on one of the links on the left panel.
You have three options here. You can view the raw cookies for this IP address (discussed below). You can click on a URL that has a HIGHER probability of being Sidejacked. Or you can choose from the URLs below, which have a lower probability of being Sidejacked.
13. You did it, you jackfruit! gratz.
And a disclaimer: this is solely for educational purposes. No ferret or hamster was harmed while I was experimenting with the tools. =P