Hi CLKD
I'm not sure if I have correctly understood what you've asked. I'm a complete donkey remembering passwords and mostly leave myself logged on on my laptop with the non financial accounts i.e. MM, Netflix etc etc.
My kids use my laptop when home and whatever they do, I suspect logging into their own various accounts, disconnects me from mine which requires me to then re-loggin with everything. If I truly can't remember the passwords I have to request new ones. My son did it to me last week which required me to reconnect to masses of stuff, I could have killed him!
Forgive me if I've misunderstood, but if you need to reset/change a password you can do two things; either try to login and press the link to 'Forgotten your password', they then email a link and you follow the process to create a new one; or go to your account details and click the link to change your password and follow the instructions.
Good luck! x