hi,

du ug admission portal allows you to register only once. However, you can rectify error by logging again into your account through the “Edit” button at the end of each session/page till the online registration portal is open & the fee is not paid. so right now there is no chances for correction. Application correction window  was open from   September 12 to October 5, 2020. however you may ask to helpdesk for your issue at below address,

undergraduate2020@admissions.du.ac.in