So, let's say that you failed ten times in the garage to garage delivery scenario for Italy. Obviously, you don't want to see that every time you go on the scenario.
The first thing to do is open up your folders and crap and type in %appdata%, then navigate to the BeamNG.drive folder. The file order should go like this:
This PC > OS (C:) > Users > [your name] > AppData > Local > BeamNG.drive > [version]

The rest of this guide should be easy. Click on settings, then click on cloud. What to do next is pretty obvious but I'm just gonna talk about it anyways.
Click on missionProgress. If you want to get a fresh start of a specific scenario, click default. If you want a fresh start on EVERY scenario, just delete default. It's okay to delete version too.

You can select between map names to search for scenario record files. If for some reason you want to modify your records, I recommend opening them with Notepad.

Thanks for taking the time to read this guide. Now, please enjoy some random images.