Thanks for your quick reply. In fact, the 8theme products options > additional custom block shows “shop Sidebar” http://prntscr.com/c7q72t and I was wundering why I didn’t see the side bar on the product page… in fact, it shows the portfolio placeholder.
First of all, additional custom block is custom block that is displayed below the product tabs. You selected shop sidebar static block that shows banner like we have on shop page with placeholder instead of real image http://prntscr.com/c7re13 You may go to Dashboard > Static Blocks > edit Shop sidebar static block and you’ll see the banner element there.
If you want to enable sidebar for single product page go to Theme Options > E-Commerce > Single Product > and select sidebar position.