Please take the time to skim the documentation below.
The order of set-up of your show is important and is the difference between a smooth experience and stress you don't need.
You can request v10 from this linked page
PDF Tutorial for Eventing - version 1
PDF Reference manual for Eventing
PDF Reference manual for Dressage
Notes from Mark King about Set up (definitely worth a read)
Notes from Mark King about entry of Dressage data