Delete TouchPal memory

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http://androidforums.com – I am using the default TouchPal keyboard that came with android 2.1. The problem is, I once used it to input my user name in Skype (or something like that), and now everytime when I input the first few alphabets of my user name my user name would pop up in the prediction. How can I delete this memory? (Restarting the phone does not help). Also, I like the touchpal because of its word prediction. On the other hand, sometimes I need to type traditional Chinese using Changjie, that's why I have to install another keyboard- android-tcime. After installing that, sometimes touchpal does not wo (General)