To open the gallery click on the main thumbnail. To scroll through the images in the opened gallery you will find arrows located at the centre left and right of the page.You can also fast track through the gallery by moving the mouse in the direction you wish to travel over the bottom thumbnails.
There is an options bar at the bottom of the gallery page with a download icon. This will allow the you to download the images as required.
If you have any further questions,please don’t hesitate to contact me.