Click the Edit Global Options button on the module's main page, which will take you to the options form.

To control which kernel is booted automatically if the user does not choose one from the GRUB menu within the configured time limit, change the Default boot option field. If the option you choose cannot be loaded, GRUB will fall back to whatever is selected in the Fallback boot option field.

To change the amount of time that GRUB will wait for the user to choose a boot option before it uses the default instead, edit the Timeout before using default field.

The GRUB boot menu allows users to do things like change kernel parameters and read arbitrary files on Linux filesystems. To prevent this, enter a password into the Boot password field. This will limit users to the available boot options unless the password is entered. Furthermore, boot options in which the Password locked? field has been set will not be selectable either.

When done, click the Save button and you will be returned to the module's main page.