You don't really yet. It loads and attempts to run every plugin it finds. If the .Gpu assembly is in the same folder as the .exe, it's tested, and runs.
If the .Sse assembly is there, it's tested and runs. Same with .Managed.
Step #1 for me was getting an actual working miner. Next steps are making the thing configurable, usable, etc. I had previously decorated the code with Console.WRiteLIne's for each plugin, so you could see what the hell was going on, but kind of removed them all.