Unfortunately, as many people have said before, I think password changing only works for the forum, not in-game. However, you could try by logging into he forum from the Yellow box on the top right and click "user details" then password and you should be able to change it from there, apparently it's been done before? You could always try. I have not yet tried it myself but I wish you luck~
When you go into profile, go into account settings and scroll to the bottom and enter your current password first. You have to do that otherwise no changes will be made.
Same with what BigBangTheory said. ^^
Unfortunately, as many people have said before, I think password changing only works for the forum, not in-game. However, you could try by logging into he forum from the Yellow box on the top right and click "user details" then password and you should be able to change it from there, apparently it's been done before? You could always try. I have not yet tried it myself but I wish you luck~
I tried before and It works :D