Hi there,
We do apologize, but this is not yet an active feature. But I can see that it's already been added to our Feature request, and hopefully, soon enough, it will be implemented by our Team.
You can also check what we are currently working on, or starting next here: http://convertkit.com/roadmap15
If you have further questions, I recommend you email help@convertkit.com27 to take a look at your account.
Thank you!