1. To change the background image, click on "Edit this row" button (pencil icon) in the top right corner of the row element in Visual Composer. Rows that have a background image set on them, will have a preview image added next to their options.
2. Click on "Edit this row" will open a pop-up with 2 tabs. Click on the "Design Options" tab.
3. Here change the "Background" option. Click on the "x" inside the image to remove it or click on the "plus" sign to add your own.
4. Click "Save changes" to close the pop-up.
5. Save the page by clicking "Update".