InfoPath Dev

Hi,

I am trying to update a list item that I created within SharePoint (SP) using SharePoint Designer (SPD).  I click 'Actions', 'Update List Item', then click on 'this list'.  The 'Update List Item' window pops up, and I choose my Form Library from the 'List' drop down.  Then the 'Find List Item' section appears at the bottom of the screen.  I choose the Form Library's ID as the 'Field' and also as the 'ID'.  Now above, when I go toward the top and click 'Add', a pop up comes up and in the 'Set this field' drop down I can only see "Name (for use in forms)" and "Title".

How do I get the columns in my SP list to appear there?  And/or the fields from my InfoPath form?

Or, I suppose the simple form of my question is how can I update a List Item from a SP List via SPD? 

Thanks! 

1. this field in list on share point need blue color, that's mean this field can modify by others, you can check it on site setting : columns.

2. when this field set down then you will get this data on SPD "update list item" -  "current item"