The person whom you want to add a director must be eligible as per the Articles of Association. And he has to give his consent in writing for appointment as a director.
The Articles of Association of a company as per section 260 and section 284 of the Companies Act, 1956, provides the authority to the Board of Directors to add new directors or remove existing ones. The person whom you want to add a director must be eligible as per the Articles of Association. And he has to give his consent in writing for appointment as a director which the company must register with itself.