Udemy login

I purchased 2 courses and started to work on the one course, but as I tried to log in this afternoon, I cannot log into Udemy. It doesn't want to accept my emailadress and does give me the option to log in using my registered details as I used the past few days. I tried everything try and get the login as it was displayed but in vain. can someone please assist me as I would like to complete my training.