You can change your password directly from this screen if you remember your current password. Enter your current password and the new password that you want to have for your account and then save it. 

If you don't remember the current password, you need to logout and then log in, tap on the forgot password, wait for the reset password email and enter the new password that you want. 

For account security, read this article in our help centre about how to choose a smart password.