when you are in game, On the top right corner you see your name & your display picture, click on that it will take you to a new window, there are multiple tabs click tab profile on it & scroll down a bit, you will see change password link there.
What about other games, this doesn't work in Vikings for example.
I think it's the same password for the whole web site, so shouldn't the website have a way for me to change my password?
Of course it does. When in any of these games, click your name in the top right corner of the browser window (just above the game):
This will open your profile in a new tab or window (likely tab, but it depends on the browser and its settings). There, pick "Profile" (the last item in the top menu), and there you'll fine "Password" under "Profile information" (should already be selected):
