The credit line at the bottom of your page can be easily removed if you choose not to have it visible.
1. Select the Design tool in the gray navigation bar. Under the Sitewide tab on the right-hand menu, select Footer.
2. Scroll until you see the Credit panel, and uncheck the Show Credit box to make the credit text disappear.
3. Select the Save button, and then the Publish button to take your changes live!