Using the instructions here :

Writing Data to Excel from Nintex - SharePoint Blog 

This is the screenshot that the author shows:

However, when I try to duplicate this, on the last step (Web service output), I cannot choose soap:Envelope as the element, the "Apply"(save) button is greyed out and I have to go further down the list to get anything to respond, at which point "Close" is not an option.  See below :

My updates of course, are not working when I choose "Default value" - what can I do, or what am I doing wrong to replicate the screenshot in Shawn Lawson's example?