Open the tool, select the .exe file of the wolf RPG game
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click on Start Game (You might have to turn off your anti-virus since it might give a false positive and stop the game from launching), don't use inject to running game since it does not support wolf rpg at the moment.
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After that you can switch back to the mtool window whenever you want to change something.
One more thing, for whatever reason after you inject with mtool and make a save file, the same save file is no longer found when you open the game without mtool (However saves from before you injected with mtool is still there when you inject with mtool and open the game unless you overwrite that save slot). Not sure why, but opening the game again with mtool will recover your save file. It's like using mtool generates an entirely new instance of the wolf rpg game you're playing.