You can change your Console password whenever you need to, for example if you think someone else may have seen it.
Open password settings
Click your account name at the bottom of the left sidebar, choose Settings, then open the Password tab.
Change your password
Enter your current password.
Enter a new password, then enter it again to confirm.
Click Save.
For an extra layer of security, also turn on two-factor authentication (see Securing your account with two-factor authentication).