Triggering an action via a rule - Agentry

Hi;

I am working on SAP Work Manager 6.0 customising, using Agentry 6.1.3. I have this loop action that I am using to find an object within a collection with field B stamped "X" and when it does find it I would like the value of field A within the same row in that collection to be printed to the screen. Now for this action to execute, I need to trigger it, how best can I trigger an action via a rule in Agentry, in such a way that the rule runs the action and stores the value of field A on a row where field B is X and then concatenates this field A value for printing on the screen?

Your input is much appreciated!

Thanks and Regards;

Sizo Ndlovu