do you have full root access? i beleive you need to have root access to install ion cube, which, if your on a shared server i dont think you wil have. if you have root access then PM me and ill help you out with it.
Best is to install it from root & editing the values in the phpini.. It can also be installed on shared hosting but will be slow & most of the loading time will go for the ion cube loaders to load.