You can change the passwords for your accounts by yourself via the Selfservice. To do so just select the tab "Accounts and Passwords" and then "Change Passwords", choose an account/ accounts by checking the box in front of them and click next.

It is possible to choose a different password for each account as well as choosing the same password for various accounts with the same password regulations.

Link to the video tutorial: https://www.youtube.com/watch?v=kHKpQ5X5v5Q