Never mind - I have managed to find it now. In case anyone else has a problem, here's what happened:
I edited our game entry but the "Distribution & Price" page didn't include any price information. I left the developer console, came back and clicked on the "Draft" entry. Now, when I go to "Distribution & Price" the option to set the price is there.
@Daffy_The_Bunny, let us know if you require any additional assistance. We've recently implemented USD as a base price so you can just update the base price and have it automatically change for the other regional currencies supported by Viveport.
Please note, that once you make any changes, you need to hit "create production release" on the submit tab to push those new settings to our CRM (if it's an already published title).