To add the autosplitter to livesplit do the following:

1. Right click the main livesplit window and hit "Edit layout..."
2. In the layout editor click the + sign in the top left of the window and goto control -> Scriptable Auto Splitter
3. Next double click the "Scriptable Auto Splitter" in the list of things in your layout, if you haven't changed your layout it should be under "Previous Segment" or "Sum of Best"
4. Now click the "Browse..." button in the top right side of the new window and select this file.
5. If you are running any% feel free to leave the Start, Split and Reset boxes all checked, this will allow livesplit to auto start, split and reset your timer.
6. That's it! You're all setup.