On a VM with guest tools installed, the platform can generate an initial guest password. This requires the privilege to "Retrieve virtual machine initial password".
Abiquo 5.0 enables the user to reset the guest password in vCloud Director. This requires an additional privilege to "Reset guest password".
To reset the guest password, go to the VM details → General and click Reset guest password
The platform will send the new password by SMS or email. See Guest setup for configuration details.