Hello everyone, I'm a student and I use my MacBook Pro in my room at university connected to the internet using an ethernet cable. I have an iPhone (4S) and would like to share the connection to it, so I don't run up my 3G data allowance whilst sat in my room. I've managed to share in internet connection, but not with a password. Here's my system prefs: I just don't see an option for passwording, or maybe I'm doing the whole thing wrong. I just need to password it because I don't want other people in my building stealing my internet! Thank you.