You have these options for Objects and Bodyparts.
Enable trigger system: Just check the box
Group: Just check one of them (all bodyparts are the same, the object is another one)
collide with: The body part collides with the object and vice versa
Trigger action: uke (uke wins)
I have also added two examples i have made.
I have only changed toris right hand and ukes left hand in the first mod (Trigger.tbm)
The second one has all body parts changed because changing everything can be a pain in the butt. (Trigger_1.tbm)
I changed them in the Notepad, because it's usually faster :P
Modmaker related questions can be ask in the mod subforum in the stickies.