greyhound ranking in triggers

Hi, I know this is probably incredibly simple, but i cannot find it myself.  I am making a trigger for greyhound racing, I have worked out most of the other items but i cannot work out how to tell the trigger to bet on particular rank i.e. third favourite or fourth etc.  i have been playing around in the trigger editor but i just cant find this particular variable can someone tell me how to do this please
thanks 

Hi
Either click the Selections dropdown, or click in the conditions box and add a condition. Please see attached screenshot.
Rank 1 (favourite) in MFP is defined as the selection with lowest back price. Bear in mind in greyhound markets until traded volume increases in the last few minutes before the off most selections will have low back prices and ranks will not be a true reflection of the market. 

Re Ah of course.  How dumb do I feel. I’m still learning my way around this trigger thing.  Thank you for the reply.