Here are the steps you should follow:
- The user must log into Salesforce.com and click on the SMS- Home tab once.
- Simultaneously, open the SMS Magic customer portal(https://sms-magic.in/) and in the login window, click on "Sign in with Salesforce"
- Follow the next steps as directed
- Once done, you can check that the new users would be listed at the SMS Magic portal along with the other users registered to your account at the SMS Magic portal