Sears customers can activate credit cards online by going to Activate.SearsCard.com. After the cardholder logs in, the site asks for the information necessary to complete the activation.
Completing the first step in the registration process involves providing basic information such as the card number, name on the card, last three digits on signature panel and last four digits of the cardholder's Social Security number. After you fill in the information on the first page, the site asks for profile information, followed by security information, and finally, settings. After you've entered the information properly, the company activates the card, and you can manage the account online.