Now we want to make sure that the WSDL or Endpoint URL that you given work. So what you should have is a green hour-glass looking thing... this is the WSDL binding to the Endpoint URL (in plain terms it the web service).
1) Expand the green hour-glass (when it expands you should have at least 1 item listed (each item is referred to as an "operation")
2) Expand the first Operation or any of them you care about, but since your testing this you should know which one you need to look at...if not ask the developer that sent the WSDL to you which operations had changes.
3) When you created you project, but default there should be 1 soap request under each operation ("Request 1")
4) Double click on the "Request 1" under any of the operations (you will now be looking at an XML "sample request" for your webservice)
5) Now you need to look at the request and try to populate values for everthing that has a "question mark"..."?" are entered by default for every "required" and "optional" value, so not all of them are required.
6) If there is something like username / password...which is very common. Then you have to provide a valid username/password to get this sample request to work. Note: you need to be focused on just getting something to work at this point so focus on only the required values. a required value will generally NOT be comment and showing in green...normally those are optional
7) Once you have the "?" either all have been populated or atleast all of the required one's, then you can click on the "Green Arrow" pointing to the right and you with get a Response to display
Try this an let me know if you get a valid response.
Question: Where did you get the WSDL URL that your using? If I know more about it I could be of more help.