Cognizant Technology Solutions — Facing a problem while filling the pre -joining formalities

I am facing a problem regarding pre-joining formalities. we were given particular tasks to complete. In student questionnaire form, it was necessary to fill some data and unknowingly I added the wrong information. Now when I am trying to undo that but I couldn't.
The informtion which iam tryng to undo is the dates of particular certified courses. The main problem is to delete that particular dates.
Please help me solve this issue.

Thanks