Good day, info851.
I'm here to help you change your currency into Rand. You should be able to change your Currency on the Advanced Company Settings page.
In case you've already turned on the "Multi-currency" feature, you can't change the home currency anymore. If that's the case, you'll need to cancel the subscription or get a new QuickBooks Online account.
You may want to take a look at these write-ups to learn more about multi-currency in QuickBooks Online:
You always get back to me if you have any other home currency concerns. I'd be more than willing to lend you a hand.