To be able to generate content feeds of Facebook groups and make posts to your Facebook group, two conditions are necessary: you should be a member of the group and RSS Ground app should be added to this group. You can make posts even not being a group admin. However, only group admins can add or remove RSS Ground app.
To add RSS Ground app to your Facebook group:
- From your News Feed, click Groups in the left menu and select your group.
- Click Settings in the left menu.
- Scroll down and click Edit next to Apps, then click Add Apps.
- Select RSS Ground app and click Add.
As soon as RSS Ground app is added to the group, you will be able to select it in the Facebook Feeds generator and Facebook Poster campaign.