I just got SmartFTP and am trying to figure out how to set up Uploading to Imagevenue.

I entered the URL by copy and pasting it from the browser...changed and simplifed it in as many variations as I could.
I know my username and password and it works fine on the website
But I cannot set up SmartFTP for uploads. I get any number of errors. Am I supposed to enter Imagevenue's "FTP Address" which I have no idea what that might be? Can someone explain to me how to get set up?