Hi Pamela,
Thanks for taking the time to reach out to us here! If you’d like to administrate your existing site under a different account and/or license key, you can easily make this change without affecting any of your current events or settings. Simply log in to your WordPress site’s backend, navigate to Events > Settings > Licenses from your WordPress sidebar, and enter your new license key in place of the existing one for Events Calendar PRO. Once you’ve clicked the button to submit your changes, your new licensing will be applied to your site immediately–no need to adjust any settings or reinstall plugins. 🙂
I hope that helps to get you on your way here! Thanks again, and please don’t hesitate to follow up if you should have any other questions or concerns!