From the website itself you will get the competent authority where you will have to make an application.
if not then seek your localhelo to know the competent authority whom you will have to send application in writing with all necessary details along with your income proofs.
Such permission takes time and needs to be followed on compliance of several procedures.So keep patience till you get such permission.
Acquisition and transfer of immovable property by Indian residents outside India and Non-residents in India is regulated in terms of sub-sections (3), (4) and (5) of section 6 of the Foreign Exchange Management Act, 1999 (FEMA) read with 1Notification No. FEMA 7(R)/2015-RB dated January 21, 2016 and Notification No. FEMA 21/2000-RB dated May 3, 2000, respectively. These Regulations are amended from time to time to incorporate the changes in the regulatory framework and published through amendment notifications.