Inform them that SFI and TripleClicks maybe accessed from Smartphones, Tablets and all Android Devices.
It could be that they don't have a Laptop or Desktop Computer and as such, believe that they don't have access. In this age, most persons worldwide have these devices. I personally didn't have a smartphone but saw the need to get one since joining SFI so I have SFI & TripleClicks on-the-go.