Hi there and welcome
Can you tell me the make and model of the device with the problem and the message you get when it fails to connect?
Do you have windows computer already connected to the wifi network?
ok, that wont help to get the password.
What are you talking to me on now? A computer via a cable?
ok, do you have a computer there? Even if it is not connected via wifi?
ok, what is the make and model of your wifi router?
well not screwed, just makes it a little harder, dont give up though...
click this link, tell me what you see
how did it go?
ok, try this link please as if they open I may know the make and model