Abs light

Right I need to sort my abs light out, I see there is a how to regards the abs ecu but were do I find it and when I hit the speed for the req distance will the light flash once or keep flashing so I can read the code or do I need to get some one to check as I drive??

http://www.gtir-motorsport-club.com/t82-abs-fault-check

Its on the passenger side footwell on the left you will need to pull the carpet down its between the door and glovebox ....

Fanny tactic Leighton