HOW TO START IN DIFFERENT DATE

I had enrolled in the data analytics course today. But I am currently having my exams right now. when I asked in the q and a of the webinar session if I can start the program later they told yes. But in the dashboard the deadline for Data Analytics Process is given as 26th April. But I am currently having my exams and want to postpone my starting date. How to do that? Kindly provide guidance. Thank You