however how to use CudaBrainSecp
[/quote]

You use CudaBrainSecp by simply running ./CudaBrainSecp

There are no other commands, so it's very simple - only the configuration file GPUSecp.h

If the test cases are running succesfully then you can replace the test books / hashes your books / hashes and try recovering your desired keys.

Please look in Real Launch section about how to do it.