you would need to edit the xml file to include the S3 paths on your PC as well as update the AOI with the WKT of your AOI.
More info is found here - Sen - ET plugin (Sen-3 preprocessing graph) - #8 by aforarpit22
If you want, you can compare my edited Graph to yours OR just open mine in Notepad to see where I have made edits and you’ll have to make the edits in yours corresponding to the paths you have on your PC as well as your WKT (polygon location) basis your Area of Interest.