Based on your screenshot, there are two things missing (one of which is kind of important).
The important part is: do the “Get Request Object” on your “VA JSONRequest” and use that for your “Set Field”.
Other than that, I greatly suggest you Bind “OnRequestComplete” and “OnRequestFail” from the same “VA JSONRequest”, otherwise it’s going to be a bit tricky to figure out what went wrong (or right ;)) Use the “Get Response Object” from the “VA JSONRequest” in order to see what the server is returning to you.
Hope this helps get you on your way.