You will find the 'field' between the 'come' space and the 'don't pass bar'. On some craps tables, the space for the craps field bet actually looks like a field in the middle of the table.
On the craps table, this bet is located in two large squares in the middle of the other bets, right in the middle of the table. The craps field bet is an easy bet and it is suggested that beginners bet the craps field bet when starting out.