This is a step by step guide for adding a gallery in Massive Dynamic.
1. Install and activate Visual Composer plugin from WordPress dashboard >> appearance >> install plugins
2. Open the page which you want in edit mode from WordPress dashboard
3. Choose “Backend editor”.
4. Press the “Add element” button.
5. Find the “Media Grid” shortcode and set it to the page.
6. By using the media grid setting panel you can change the layout of it.