Hi,
Well you can update your signature or other details on your portal that you have after your registered for CUSAT. Just visit the official website and then login and update the details that you are asked to update and submit the form as soon as you are doing doing that.
I hope this helps.
All the best.
College Comparison based on Courses, Placement, Rank, Fee
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile