1. If you can log into your account, then you will first need to visit either the main Nexon America website here: https://www.nexon.com/account/en/login or log into the Nexon Launcher.
2. After you have logged into your account, click on "My Account" in the top-right of your web browser and select "Account Settings". If you are using the Nexon Launcher, click on your Nexon ID in the top-right of the Nexon Launcher and select "Account Settings".
3. Under the section for Password, click on "Change" to change your password. You may be prompted to answer a Security Question if they are available on your account.
4. You will be asked to enter your current password one more time, as well as a new password.
If you cannot log into your account at all, you can reset your password from the main Nexon America website here: https://www.nexon.com/account/en/reset-password
You will need to enter the email address for your Nexon America account. A verification code will be sent to your email address.