MP Floating Cart Integration? + Mobile?

Hi,
I just installed the MP Free Floating Cart plugin from here - https://github.com/nathanonn/mp-floating-cart

which so far looks great, i checked the settings for it which are quite minimal (see attached)

Straight away i saw it appear on the desktop site.
(is it possible to make it only visible when the user is logged in ?)

Also (it's not appearing at all on mobile phones / smaller displays (anything smaller than 691px/692px and it disappears) is it possible to change that number so that it can be viewed even on smaller devices such as the iphone screens ?

Also when testing it and clicking the cart (currently bottom right) it just goes red and dims the screen but nothing happens? - is it not supposed to re-direct to the checkout pages?
I need it to re-direct user to this page
http://tinyurl.com/ofotmsj
along this path http://www.domain.com/store/shopping-cart/
(need to be logged in to view this page)

Domain: http://tinyurl.com/o32u9zr
Support access is ACTIVE until August 14, 2015 12:36 am

Thanks
Tom