Hi Linda,
Thanks for reaching out, and I’m so sorry for the trouble here! It looks like your existing license with us is a Personal license, which can only be activated on one site at a time, as opposed to the Business license, which can be activated on up to three sites as you describe. If you’d like to upgrade to a Business license instead, you can easily do this while logged into your account–we have a Knowledgebase article on the process here! If you’d prefer to move forward with a Multisite license instead, we can assist you with that via email. Please don’t hesitate to reach out! 🙂
Thanks for your support, and let us know if there’s anything else we can do for you!