How to change your network on facebook?

I cant figure out how. It let me change my birthday but it didnt change the network which says i graduated in 08-which i didnt. People say theres a button that says network in the homepage but theres not and i cant edit it. help!How to change your network on facebook?
You can change your primary network by going to the Networks tab of your Account Settings page. Simply click on the ';Make Primary'; link to the right of the network that you want to identify yourself with the most. Regards!How to change your network on facebook?
follow my steps :

settings

networks (along the top)

then type in the name of your network.