Loading and switching balances on my card

Downloading the Caxton app
How do I change or add a debit card in the app?
How do I know what exchange rate I will get?
How long does it take for the funds to be added to my available balance?
Who can load currency onto my Caxton Card?
How do I add a new debit card to my account or update an expired debit card?
How do I switch balance on my Caxton Card to a different currency?
What currency can I load onto my Caxton Card?
How do I load money onto my Caxton Card?
What if I'm going to a country where you don't offer the currency? What rate will I get?