I have tried the main method but Im not too sure how to make a new save file.
Hey BARAFURRYPORN thanks for posting about this.
What platform are you on? Are you saying you have deleted your save file for your config set up? If you re launch the game, it should make a fresh save in its place.
This guide should give you more details on locating saves - https://support.ubisoft.com/en-GB/faqs/000027321
If this is not what you are referring to please let me know.