On the Guest OS configuration, you can activate the Guest OS to be able to renew the password, and determine the number of times you can log in automatically.
Password Reset
The following are the steps for updating the password that will be used:
On the Guest OS page, press the Edit button.
Password Reset
The Edit Guest Properties window appears. On General section, check Enable guest customization, while on the Password Reset section, uncheck Auto generate password.
Password Reset
Specify a new password in Specify password, and press the Save button to save changes.