Hi there. 

The application form of JNU 2019 batch haven't released officially yet. The tentative dates were of October but no official announcement has been made yet. 

I would suggest you to follow JNU's official website regularly in order to not miss any important updates from their end. 

For more relevant information please refer to the following link:

https://www.google.co.in/amp/s/university.careers360.com/articles/jnu-application-form/amp

Hope this helps.