button continue course

Where can I change the link of the continue button that appears when entering the course, I have a problem and it is that when I click on this button a blank page appears, is it possible to make the change in settings? or where could I do it, thank you very much who can help me with this question.

https://drive.google.com/file/d/1tWS-b8DwiNO2McRULJxFh3asHuEmf3pD/view?usp=sharing