Anyone who can log in to the program as an administrator can reset your password through the Users Management menu option under the "My Account" menu.
If that is not an option, click I forgot my password and click through the prompts in the passport reset tool. This will remove any additional users who may be set up to log in to the machine. It will not affect any patient data.
If you do not see an I forgot my password link, update to the latest version first, and the link will appear. The update patch is available at http://aseba-pc.aseba.org
See the following video for a walk-through the instructions: