Well, for starters, you're going to need 2 investment accounts. 1 denominated in CAD and the other in USD.THEN, use the full ticker, as shown in your original post, with each respective stock. You MIGHT need to slightly alter the names of the stocks when you're setting them up. Such as Franco-Nevada CAD and Franco-Nevada USD.
Have you tried entering tickers without the space after ":", e.g., "TSE:FNV"? I'm not sure about syntax requirements ...