please spread this I really wanna know

I really want to make my sister an account but the problem is not knowing my password. When I register I use facebook and done, but when i log out and log back in I wouldn't know my pass bc it doesn't ask me to make a pass or give me one please can someone tell me how too create a pass so I can log back in PLease!!

Hello their! I hear you are doing alt accs but I really just need help with figuring out your password. I made this acc with facebook but if I log out and log back in I wouldn't know my pass only my user please do you know how I can know my pass? It's ok if not!

please can someone help me on how to get a passwrod for my acc