To edit a pre-defined rating, complete the following steps:
Right click on the record you wish to edit and select Edit Record. A window similar to the following will appear:
Make changes to the Assigned Flow fields and the Calculate checkbox.
Click to save the changes.
Click to exit Edit Mode.
Click to close the window and return to the grid.
Note: If you edit a rating, the change will only affect data from that point on (i.e. past data will not be affected) unless you run the "Recalc All" option (under System Tools).