Planning

Hello there! I’ve been trying to plan my courses, but everytime I hit the plan button, fill in the date and time and the system won’t let me update the course. If you send me an e-mail I can give you the screenshots of what I see and what my website developer sees because he is able to do it. But it would be more convenient if I’d be able to do it myself. 
Looking forward to your reply. Have a grand weekend for now!