Hi Paul,
Please follow the steps from the screenshot below.
To upload gallery image
http://prntscr.com/grfzo3
http://prntscr.com/grfzxf
http://tinyurl.com/ybbkbyk5
To set in page gallery section
http://prntscr.com/grg1i5
http://prntscr.com/grg1n2
Best Regards,
ThemeLooks Support Team