Although this looks a little bit more involved - it really isn't. It's the same thing again and again. NAME Same as above. This is the heading of the form item. It denotes how the results of the reader will arrive at your email box.
SIZE denotes the size of the box.
Try putting two there if you'd like to see what it does. I prefer just one. More than one item tends to defeat the purpose of the Pop-Up Box. This may be the easiest of all the items I've shown on this page. Here it would have been mailed to my email box.