how do i change an old email accounts pass word. i have 3 accounts that are linked but microsoft said i will not be able to link them in the future.

i have a master or regular email address i use with hotmail. microsoft said in the future they will not allow me to access the account from my mail account. i think they call this linking. well the 3 accounts i link to i fordet all the info on and i for got the passwords. i want to get in and change the pass words so when they pull the plug i can access these accounts. i just can't find a way to change them. cananyone help? (HELP I'VE FALLIN AND I CAN'T GET UP)