To run Rebelfish you will need to announce the engine first, under Chessbase this means:
Engine -> New UCI engine -> Browse -> RebelUCI.exe
Under ChessPartner do:
Extra -> Engine Import Wizard -> Winboard engines -> Install -> ProDeo.exe
Engines -> Install new engine -> RebelUCI.exe
How it works
As with the (old 1999) EOC approach, see section EOC usage during calculating the engine applies a bonus based on the results of the EOC database to guide the engine but now -- 20 years later -- the database is replaced by Stockfish running in the background. Same technique, different database and not limited to the opening phase but always available. And the results are spectacular. Depending on the time control 250-400 elo.
Rebelfish is controlled by the configuration file Rebelfish.ini visible in the corresponding Editpad tabulator.