First I agree with daplunk and want to say if you are modifiying the community files you are going to be not happy when the next update simply overwrites all your work.
Finally the above changes "descriptions" on Things and you are asking about changing summary text on Picks. If what I said makes no sense I would recommend reading the
Glossary of Terms for the Editor. Then check out
FAQ#2 for all the places to learn about the editor including YouTube videos.
In simple terms your answer is:
Code:
field[abSumm].text = "blah blah"