From the Readme:
ABOUT THE GAME
GeneRally is a racing game for one to six
players. You'll be racing on various tracks
in time trial mode, or against human/AI
opponents in championship mode.
PLAYING THE GAME
Use the slider on the top to set race length.
Select players from the drivers list on the
right-hand side by clicking on a driver's
name. The game comes with 5 default AI
drivers of 'beginner' skill - but these can
be edited (or more created) from the drivers
To create a player, click 'Create Driver'
under the driver list and define your name,
colours and controls! If you want to create
an AI driver, change the type to 'computer'
and define his skill level!
Available tracks are listed under the players
list. Click on a track name to select or
deselect it. Shift + Control can be used to
ease the selection process.