Hey.

To get registered under the Delhi high court bar association you can, obtain the Application form from the Office of Bar Council of Delhi for a sum of  Rs 1000 from their address- Bar Council of Delhi, 2/6, Siri Fort Institutional Area, Khel Gaon Marg, New Delhi-49. They do not accept downloaded/ printed forms.

Then you have to submit the application form along with the required documents. The Enrollment Committee of Bar Council of Delhi in their meetings will scrutinise the applications according to their provisions. After the approval of an Application Form the Council will issue an Enrollment Number and an Identity Card confirming the members enrollment into the Bar. 
To know the entire list if documents required us the link below-
http://delhibarcouncil.com/the-membership/how-to-apply/

Best of luck!