To change your access password for Practice Perfect, click on File from the top-line drop-down menu (pictured below.)
The folloing menu will appear. Click on Change Password (pictured below.)
The following box will appear (pictured below.)
Type your old password, then enter your new password followed by a re-entry (to confirm) of your new password.
Clicking OK will save your password changes and clicking on Cancel will discard your changes.