STEP 1: Click on the BROWSE button (magnifying glass) located on home page.
STEP 2: Browse the content page and click on the current image you wish to change the BANNER PHOTO too.
STEP 3:Click on the "Click here to change your banner photo!" the link above the image.
STEP 4: Click on screen shot you like to represent your video content...and you're done!
Note: If you do not like the screenshot choices generated by Metrixstream, you can can change the parameters by adjusting the time, the number of screenshots, or you can upload your own image.
See also: What is a Banner Photo?