Is there a way to transfer/save my guest account progress?

Hi,

I just recently downloaded Dofus Touch and tried it out with a guest account. I love the game, I used to play the PC version. I have an Ankama account, but the question is: Is there a way to transfer my guest account progress to my regular account? I don't want to lose my progress.

In the Dofus Touch login screen, I can see a "REGISTER YOUR GUEST ACCOUNT" button, but that would mean that I have to create a new account; because when I typed in my account information, it says that the username has already been used(?). There's also an "I ALREADY HAVE AN ANKAMA ACCOUNT" button, but that would mean that I have to start all over again.

Please advise.

Thanks.