There's two ways you could potentially link your Facebook page to Jumper, we'll walk them through both so both grounds are covered.
Assuming you've signed up to Jumper by logging in through Facebook, make sure you've given access to the pages and permissions Jumper requests. This is really important for automations to work well.
Navigate to Sales channels and tap Facebook
You will now see the connect button to link your Facebook account and page to Jumper. Simply follow the steps and give the relevant permissions to Jumper - all set!