Your array has a set of indices (that’s the number 1 when you look at the first element, number 2 for the second and so on).
So to access the first element of an array first(<arrayname>) will grab the first element for you. And then you can use pick() on that element which will just be a collection. It’s really important to understand what each function needs as input to properly function and experimentation with them using your structure will help you.
Can I suggest you take a look at the Make for Make Newbies video series? It will really help you out by studying various ways to manipulate data structures in Make.
–
Alex Sirota
Director of NewPath Consulting - we are 
Make Heroes! 
Check out my series of videos and scenario walkthroughs for Make Newbies