[gambatte]

Well, the problem is the initial connection and you said that it won't connect. That usually means some kind of access refusal. Once it connects, you should or it may automatically open a browser window to input that username/password. That is what happens with most pay WIFI access, e.g.ORD airport.

So you are saying that these WIFI users can connect but you need to ask if they had to do anything special from the school IT perspective to connect. There are alot of ways that networks can be configured so it is best to see how the school has it set up. They should have some "How to" page somewhere if they are not controlling WIFI access.