Click on My Settings in the toolbar at the top of the page. That will be your settings page.
From there you can scroll down and social connections will be on the right. You'll want to disconnect from facebook.
Now you'll want to push the green connect button and follow the steps for connecting your social.
There will be a page requesting permission to manage and publish your pages. Do not click choose what you allow - this will prevent us from posting to facebook. Instead click ok.
The next page will allow you to choose which page posts will appear on moving forward.