How to track tweetburner url

I created a twurl url on tweetburner but didn't have a tweetburner account. I've created an account now. Is there a way I can track the url I created before I had a tweetburner account? The tweetburner homepage wasn't very clear on this. It has a field to insert a url you want to "shorten, share and track" but doesn't say create an account first.