How do you know it can not save the password ?
Is there an error message ?
Can you then also show what that error is ? We don't have a crystal ball ...
Or DOES it save but you can not use it on your client device ?
That's something else.
As for entering info from keyboard: try to stick to normal ASCII characters for any password.
Try that first.
If that works, you know you did use something which is not accepted by your client device.
That's Quickset ?
Generally it's not really recommended to be used over here ...
It has sometimes quite some quirks and problems (as you can see right now).
How familiar are you with normal configuration through Advanced ?