From the Navigation bar, select Administration.

Select Gallery from the drop-down list.

A list of all the available images will be displayed.

Click Select at the top-right corner of the page.

The picture area will appear inactive/disabled.

Select the picture/image that is to be removed. Clicking the picture the second time will unselect it for removal.

The selected images will appear to be active.

Select REMOVE. In-front of the REMOVE word, the numbers of pictures that have been selected will be displayed

A confirmation pop-up will be displayed

Select YES