I could not update my workspace


Hello I am a student. I am using Cloud 9 but it said that I need to extra space and i want to update my account paying $1 as I am a student . But i could not do that ( see screen shot) attached).<img src="/uploads/trydiscourse4/original/2X/3/378d0274276691b27ed836545be1504cd1baac26.png" width="690" height="431">