Campaign properties can be edited by right-clicking the campaign file in the file explorer and choosing "Edit campaign" from the context menu. You can also access "Edit campaign" from the "..." button in the top-right corner when you have the campaign file open in the normal editor.
For details about these settings, see Creating a campaign.
Note that changing the Display name does not rename the campaign root folder or index file; it only changes the name that Iron Vault uses when displaying the campaign.