You can change your password when you log into your account from a computer. From there, click on your name on top right corner and go to My Profile.
Next, if you click on the Login Details, it will open up a window where you can insert your new password.
Alternatively, you can also use the Forgot Password option on the login page which will send a password recovery link to your email. This lets you create a new password for yourself as well.
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