Step 1 - Go to MANAGE EVENT > SESSIONS.
Step 2 - Click on the EDIT (pencil icon) of the session you want to change the picture of.
Step 3 - Click on CHANGE PICTURE.
Step 4 - Choose desired picture and click OPEN.
Step 5 - Adjust, crop and click SAVE once your happy how it looks, the preview side shows you how your image would look like size wise.
Step 6 - Your image has now been uploaded! Click SAVE CHANGES to confirm.
CONGRATULATIONS YOU HAVE CHANGED A DISPLAY PICTURE OF A SESSION!