Can anybody help me how to implement authentication and authorization with already created BVS repository. Please provide steps. Please help in this as it is very urgent for me.
If you search for "authorization" or "authentication" in the reference documentation ("Online Documentation" menu item on the help menu) you will find a lot of documentation items that show you how to do this. There is also an example implementation of an authorization manager in the examples repository.
You start by implementing the com.blazesoft.repository.base.NdRepositoryAuthorizationManager interface, alternatively you subclass the NdDefaultRepositoryAuthorizationManager class.
You register your implementation in your repository configuration as described in the Reference documentation -> Managing Repositories -> Repository Administration Reference -> Writing a Repository Administration File -> Adding an Authorization Manager.
This is also shown in the example in the documentation.
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