I need to add a column for the oral exams?
Juan, greetings! To add a column in your gradebook you need to go to Assignments (on left in your Canvas course) and create an assignment there. It would be an assignment and then you can select nothing submitted. Once you create it here - and make it graded and worth the correct number of points - then you can go to the gradebook and enter grades.
Hope this helps!
Retrieving data ...