This is the pop-up that shows up when I try to study my self-made lists:
"In order to get started practicing with Skritter, please go to the Vocabulary Lists page to choose what you'd like to study. (Or make sure you're studying the right language--you're in Chinese mode.)
Looks like your subscription isn't active, so you can't add more words, but you don't really have any words, either, so you can't study. If you'd like to extend your trial period to have a chance to check Skritter out, let us know and we'll get you set up again. "