1. In the event dashboard click on "Content" from the side bar.

2. Click on the small gear icon (⚙) on the bottom-right of the activity wall page.

3. "Check" to enable and "Un-check" to disable the “Post Text” to allow/disallow the posting of pure text messages on the wall.

4. "Check" to enable and "Un-check" to disable the “Post Text” to allow/disallow the posting of images on the wall.

5. "Check" to enable and "Un-check" to disable the “Post Text” to allow/disallow posting of Gif's on the wall.

6. "Check" to enable and "Un-check" to disable the “Post Text” to allow/disallow the posting of videos on the wall.

7. Click "Save" to persist the changes.

Tip: Un-check the “Post Videos From Gallery” to disallow the posting of videos from the gallery on the wall.