Hi Hardz,

               I am here to answer your query. You have to choose on option among Freezing, Floating, Sliding based on following 

• If you are satisfied with the seat you got in the 1st round and accepted it and you want to take this seat and don't want to participate in further option then you have to choose the FREEZE option. 
•  If you accept the seat in the 1st round and you are not satisfied with the seat in that college and you want to change Institution then you can choose FLOAT option. Then you are allowed to participate in further rounds if you got a seat in some better College/Institution is offered and you accept it then you go for it otherwise you can continue with the same old seat.
•  If you got a seat in some institute and you want to change for some other high preference in the same institute and if you want to accept it you can otherwise you can continue with the same old seat. Then you can choose SLIDE option.

                                 If you want to know more regarding this then please visit the link https://engineering.careers360.com/news/josaa-2015-round-2-what-does-josaa-latest-notification-on-floating-and-sliding-options-mean-119572

   I hope this will help you.

   All the best.

   Thank you.