<p>I puzzled about this one for a bit, as well. Your son can transfer money from the same account you used to pay his tuition. You put the funds in by bank transfer, then he can access them through the TechCash site and transfer from to his card.</p>
<p>PS - make sure he knows when you are funding his next tuition, otherwise he might inadvertently transfer your next tuition payment to his card ;-)</p>