How can I become a member of the Alumni Association of Jamia?

You have to register yourself by submitting an application form given in the Alumni Web Page

How do I obtain my degree/certificate?

To obtain the degree/certificate one may write to :
The Controller of Examinations,
Jamia Millia Islamia,
New Delhi-110025.
Samples of the application form for obtaining the degree/certificate is also available on the website.