Changing my password is something I do occasionally. Not often enough, with an interval of 3 months not being that bad, and at least that infrequent to not remember how to do it. I surfed the Maastricht University website and searching it for 'wachtwoord' finds a lot of stuff (which seems Google-powered), but not how to change my main account.
In the end, I found this option in the Outlook web interface, which is of course a very natural place to search for it, unlike the "Employee Self Service" :)
Is there a better way? Can you change your password, for example, via My UM?