It seems pretty simple to me.
Open up your roster page (or anyone's for that matter) and set your cursor on a worker, for instace, John Cena.
Say his overness is 90, and you think a more realistic total is 80.
Open up arsenic, or rather the EWREditor part of it, and if you adjust any variables and then just close the ediot (this may not even be necessary), your changes will be reflected.
You'll have to reload. For instance, just click on Johnny Nitro, then back on Cena, and your changes will be reflected.
This is good for fixing face/heel without having to change them in storylines, if you're just starting a fresh game.