We have checked this for you already and unfortunately it is not possible to show share box in responsive mode because this will broke the style of your items. But to move tabs under that are on the left side, under the image, you must change Product | Style option to Wide description below image under Theme options > Blog, Portfolio & Shop > Shop section.
We don't have them because users in the past requested that they don't want those buttons on mobile devices. But if you really want them on mobile, you can try to use below css but if this will broke anything, then we won't be able to help as this is not easy to make it within custom css only:
It's not theme issue. Please open your website in Firefox html mode (CTRL+U) and check how many html errors you got. Please fix them first and all should be fine.
As we see, now everything is ok. Does it mean you finally handled this? Because as we see, products display properly and the add to cart button does not appear.
Comments
please send us url to page where you want to display share buttons in responsive and we'll have a look on it.
Thanks!
http://postimg.org/image/utn8pevkv/