Hello vonrock,
Please follow the steps below to disable the password in Parallels to make changes:
If the Parallels Desktop menu bar is visible at the top of the screen, choose Parallels Desktop > Preferences, and then click Advanced. In the Require password to section of the Advanced pane, you can disable (uncheck) restrictions on the following operations for non-administrator users:
1) Create a new virtual machine.
2) Add an existing virtual machine.
3) Remove a virtual machine.
For more information please refer : http://download.parallels.com/desktop/v9/ga/docs/en_US/Parallels Desktop User's Guide/ to configure Advanced preferences settings.
Last edited: May 28, 2014