Nondini,please read the first post of this thread
http://www.banglatorrents.com/bangla-dramas-main/36-how-to-download.html and dont try to play the file with real/win media players coz it will not work.follow what Anonno said in the above thread.if you still have any problem,lemme know.
and the hell SEED (:D ) is just a person (any member,not any specific) who has completed the downloading and now uploading it for you.If thrs no seeder,you wont be able to download.If you find that some episodes dont have seeder,please post a message in those threads like "pls seed and blah blah blah".and you may c the number of seeders just right beside the file which you downloaded from the first post of this thread.
i hope you will be able to figure out things and enjoy your stay here :)