(1) If the user remains the same but you are changing only the PC or browser:

Please click the link below and enter your Member ID and email address on the screen.

Change PC

You will then be able to use the service from the new PC. If the message "Invalid User ID or password" appears on the PC change screen, please verify that you have correctly entered uppercase and lowercase letters for the Member ID and that you have used only half-width alphanumeric characters.

Also, please ensure that the email address entered matches the one currently registered in our system.

If the error persists, please contact Customer Support (support@marklines.com) with your full name, company name, contact information, and the error message.

We will get back to you via email.

(2) If the user is changing and you are also changing the PC:

Please refer to the section on Regarding new user registration and changes.