That is your external IP, not internal. They are different.
An Armed Man V3 - Follow the guide in the OP, it should work. If not you may need to ask your parents for help.
i have followed the OP guild and i have asked my parents (my parents have windows so they would know nothing about macs)
just to tell what i am doing,
1. google my IP adress
2.copy and paste the IP into airport utility
i press ok or what ever it is and then it takes ages to load and then says that no airport or wireless was found