Hi Rebetta, thank you for coming to the forum.
I'm sorry to hear about the trouble you're facing, I will be happy to assist in the best way I can.
Please click this link for the complete guide on how to find your Wi-fi password then enter it on your iPhone: https://support.microsoft.com/windows/2ec74b2e-d9ec-ade1-cc9b-bef1429cb678 once registered, it will be saved shouldn't ask you the next time.