If you see any errors or warnings, something has gone wrong - possibly a corrupt download or the files extracted wrong. If problems persist, ask for assistance in irc://irc.rizon.net/coderbus or in #coder-public on discord. Once that's done, open up the config folder. You'll want to edit config.txt to set the probabilities for different gamemodes in Secret and to set your server location so that all your players don't get disconnected at the end of each round. It's recommended you don't turn on the gamemodes with probability 0, except Extended, as they have various issues and aren't currently being tested, so they may have unknown and bizarre bugs. Extended is essentially no mode, and isn't in the Secret rotation by default as it's just not very fun.