<p>When I try to enroll USC, the button "submit using Credit Card" does not response. How can I enroll then?</p>
<p>You have plenty of time - commitment deposits are not due until May 1st. Wait a few days and see if it works. If it doesn’t, call USC and ask. Again, you have plenty of time.</p>
<p>Also, try a different browser (if you haven’t done so already). Sometimes controls don’t work for me in IE, but they do in Firefox and Chrome.</p>