Can I change country of my clients from outside of Australia?

Good day, devi-setiawan.

I'll help with your question about editing client's information in QuickBooks Online. I'd also like to ask if you're referring to the address or to the currency? 

If you're referring to the customer's currency, it can no longer be changed once setup. You'll want to make the client inactive, then set up another with the correct currency. Here's how to make it inactive:

1. Go to the Sales menu and proceed to the Customers tab.
2. Look for the name of the client and click on it. 
3. Click the Edit button under the Customer Details tab.
4. Select Make inactive, then click Yes.

If you're referring to the client's address, you just need to proceed to the Address tab and change the information in the Country field. 

Let me share these articles with you for additional details:

• Edit Customer Information
• Assign A Foreign Currency To A Customer In QuickBooks Online

The Community is always here if you need anything else.