If you forgot ur DCET UserID,  you can get it where you applied for DCET ie in cyber center

Once you got ur user id, you can change ur password, click on forgot password

Then enter your I'd and application number and  then click on upper region where they gave a chance to change password then you enter your date of birth and  you will get a otp enter it & enter the security code, you will get a chance to change ur password, select the word which you like as ur password, it should contain 8 digits with atleast one alphabet, one number& (@) submit it then your password will change.

thankyou, I hope it helps you, all the best, feel free to approach for further queries.