Conversion of shareholder to director

Obtain Consent of Proposed Director
Digital Signature of Proposed Director 
Obtain Director Identification Number (DIN)
Issue of Notice of General Meeting
Hold Extra Ordinary General Meeting of the Company
Issue Letter of Appointment.
File form DIR-12 to ROC.
Making Necessary entries in Register of Directors.

First surrender all shares by the proposed director, if you want to appoint him director without shareholding

conduct a Board meeting and passs a board resolution for appointment as Additional Director reports and file DIR 12 with MCA . you can regularise him as Director in AGM