Driver Setup is a Session Rule. It only works in Sessions.
From the Surveyor Screen menu icons (top left of the screen) open the 
Edit Menu (the 2nd from the left) then select the option 
Edit Session.
The 
Driver Setup Rule is usually the top rule in the list. Click on it then click on the 
Edit button at the bottom of the window.
All the locos will be listed with drivers and (if added) their AI driving commands.
A more detailed description of how to use the 
Driver Setup Rule can be found on the Wiki at 
https://online.ts2009.com/mediaWiki/index.php/How_to_Use_Driver_Setup_Rule
Make sure that you save the Session and give it a distinctive name (don't leave it as "Default").