Hello!  If you are talking about your Microsoft Account password (email and password used to log in to Windows 10), you can reset it here.  if you did not use a Microsoft Account and just used a local account, you may want to post your question in the Software and OS forum here. 
Help!  I got a dell laptop a few months ago.  Haven't used it recently & forgot the password.  Dell wants $129.00 to help me.  Any suggestions?
password