Two accounts

Hi..I registered an audioboo site and downloaded several boos. I also linked it with my smart phone.

One day at work i went to log in but had forgotten my log in details so logged in via my twitter account. As a result I now have two accounts with different boos in both. I really to want to combine them into the one account now that I've retrieved my original log in details and be able to access same from my phone. How can I do it please?

Thanks. Rob