@rmuru2007
Welcome to broadbandforum.co
1. Since you say you are getting connected at 500kbps, you don't have to do anything in the modem.
2. The ID and password are incorporated in your modem. unique to yourself.
For corresponding with BSNL you need to know your ID. along with Telephone
number.
3. If you are on unlimited plan, no need to check usage.Otherwise , If you want to track your usage You will need another 14 digit ID /password for this . more about this later.
4. To program the modem Id and Password are different.
usually admin admin or admin password.
Now, for the present you don't need to try.
5. Since you have accessed this page/forum ( presume on your BSNL broadband new connection), your Internet connection is Ok and you can surf the web pages. No need for password.
6.Hope your connection is now "Always on ". If you were told to dial to connect,
You must know your ID and password.
UPdate: Enjoy Internet connection .