Can you please include the version number so I could help you further.
I just downloaded trillian from your site and I was wondering that how could I have mine and my sister's different login name on the start up.
Can you please include the version number so I could help you further.
I have download version 3.0
Ok I just double checked their features for pro version.
Here is the link to check them: http://www.ceruleanstudios.com/learn/
You can have multi login only if you have pro account which you can buy at https://www.ceruleanstudios.com/buy/buy.php
Let us know if you have more questions.