Six demo BO, on the other hand I couldn't scroll all the way down to bottom of the side menu to access the module. It's because by default the menu does not scroll, in order to't watch the links to the bottom. You will find a free of charge module available https://socialbraintech.com/story4275509/top-guidelines-of-prestashop-live-chat-support-with-zopim-zendesk-chat