1. On your dashboard, click on icon and choose the Facebook Page/Group you want the tab to be added.
2. Go to your Custom Tabs tab found on the left panel.
2. Enter the tab name you prefer and the URL of the supposed content of your Facebook Tab.
3. Once confirmed, you can proceed to further edit, remove, or publish your custom tab. Note that if you have several tabs, you may only published one tab. It will be automatic that the other tabs will be deactivated or unpublished.