Hello Ted,
In your Joomla back end please go to "Components" -> "SP Page Builder" -> "Home" -> scroll down to the "Tweet Feeder" add-on and click on the little pencil icon to open this add-on for editing.
In the presented to you "Twitter Feed" modal box replace the default values inside the "Twitter Username", "Consumer Key", "Consumer Secrete", "Access Token" and"Access Token Secrete" fields (see attached below screenshot) to your own or delete them until you figure out what your own values for those fields are.
Click on "Save" button at the bottom of the modal box to save the changes you made in the "Twitter Feed" addon and then click on "Save" or "Save & Close" to save the page.
Please see the screenshot here for a better understanding.
Feel free to let us know the update.
Thanks!