You can change your password in the software by following the next steps:
• Go to the "User" page of the software.
• Select the user you want to edit.
• Click on "Edit".
• Click on "Change password".
• Input the new password.
• Click on "Save".
• Synchronise the user data to the terminal.
You will find more information regarding the user creation in section 1.8 of the software manual.