How to register for JoSAA 2015?


I’m confused whether the ‘JoSAA Registration’ and ‘JoSAA Choice Filling’ are the same thing or different. If they are different, how do I register for JoSAA? Do I have to separately register for JoSAA or I have to just enter my JEE MAIN roll no. while logging in for choice filing.
(I know the eligibility criterion of JoSAA and I am eligible for the same)


I moved a post to an existing topic: JoSAA Discussion