First, make sure the JFBConnect backend > Configuration > General > 'Enable Social Toolbar' option is enabled. Without this, the toolbar won't show on the front-end. It may be as simple as that.
However, to set the permission you mentioned - If you go into the JFBConnect backend > Overview area, click on the "Options" button on the top right (near the Autotune button). From there, you can turn on that permission for the desired user group. For instance, if your channel owner is an superadmin on your site, set the option to "Allowed" for Super Users. To get the social toolbar to show up, you may also need the 'View Open Graph Debugger' permission as well.
-Melissa