To change your password you need to tap on the top-left corner to access your profile and then tap Edit Profile.
Changing your password from here
You can also change your password from sign in screen, as explained here, which would probably be the case if you forgot your password.
Enter your new password and reenter it in the Confirm Password field to avoid typos.
You can tap (visibility icon) in each field to show the passwords as you type them.
Tap SAVE to apply the changes.
You will now need to sign in to the TeleConsole with the new password