How to change password without the game installed?

Is it possible to change your password without the game client installed?
I uninstalled it cause i wanted to take a break and play other games.
Just want to change the password now to something more secure so it does not get hacked...
Do i have to reinstall the game ?

Go to PlayNC.com and click on the "Account" tab

If you already have an account, you can change your password there. Otherwise, you can create a "master account" that is associated with any NCSoft games you play; making it with the same e-mail address you used for your GW account will tie the two accounts together. From there, you can change your GW password.

Thanks.
Done.