You can edit the content that appears below your site name in your website's footer using the "Footer" content settings found under Website > Site settings > Footer in your NationBuilder Control Panel.
The links in the Learn More and Get Involved columns are controlled via page tags. Any page tagged with "learn more" will appear in the Learn More column, and any page tagged with "get involved" will appear in the Get Involved column. The links will always appear in alphabetical order.
The facebook and twitter links in the Connect column are automatically populated with links to the facebook and twitter accounts of your website's primary broadcaster.
The disclaimer and copyright text that appears in your footer can be updated by modifying the content on your /footer page.