How to alter existing page of a node that is Organic Group and add Two links above i am using Drupal 7 with og support and also the og corresponding modules (og, entityreference, services_menu) inside DrupalGap.  

As can be seen from the picture i want to add some links(drawed in red color) on top of the display of an Organic Group. I want the subscribe/unsubscribe button AND the navigation buttons above.
Create a Custom DrupalGap Block
Place it above the title block within the region configuration of the settings.js file
Use a List Widget and some CSS to render your buttons above the title