Add a new Facebook widget from your dashboard.
Select a widget type from the list.
Click Connect via Facebook on the connection panel. You'll now be asked to log into your Facebook account, unless you're already logged in.
Select the Choose what you allow option.
On the next page, ensure that Manage your Pages is toggled on.
Check the box next to Pages. Then check the box next to the names of the Pages you want to use in Geckoboard.
Next, make sure Access your Page and App insights is toggled on.
Finally, click OK.
To connect a different Facebook account to the one you've already connected to Geckoboard, see connect multiple accounts to data sources.