if you meant your email account password, go to a pc browser and reset it from there
If you meant your lockscreen pin, then go to a pc, log in to account.microsoft.com, go to devices and select your phone - select lock phone and then unlock it using the new key you used
If you need additional help or have more questions or details to share, please join the site so you can reply in this thread. See this link for instructions on how to join Windows Central.