San,
It depends on the Orange Livebox you are trying to connect to.
I have experience iconnecting my IPad 2 to two different Liveboxes.
The first way was to ensure that you are typing the password in correctly, and when I say this, I mean exactly correctly. The mistake that it took me a while to figure out was that I was inputting lower case characters when the password was all uppercase (and numbers). Therefore the password is case sensitive.
That was enough for the first one.
The second one was a little more tricky. Basically, you get to the point whe you have to input the password, input the password but don't press enter or go (therefore type in the password but don't actually submit it). When you have done this, you have to then reset the livebox. There is a small hole on the back of the box that you need a pencil or something small to press the button. When. You have pressed this, you then wait a few seconds and submit the password.
Hopefully one of theses should work.
Steve