Can I change my Invoicing to English sterling ,

Hello,@leotracey60-gmai.

Thank you for posting here in the Community. I can help walk you through the steps on how to change the currency to your customer.

Please note that once you turn on the multicurrency, you can't undo. Also, you're unable to change the currency for an existing customer. You'll need to create a new one with a different profile and be sure to select the foreign currency during creation.

Let me guide you how:

1. Go to the Gear icon located on the upper right side. 
2. Click the Advanced tab. 
3. Hit the Edit button perpendicular to Currency. 
4. Choose your Home currency in the drop-down arrow. 
5. Put a check marked on the Multi-currency, then tick the box in the I understand I cant undo Multi-currency.
6. Tap Save, then Done.

For the detailed guide, check out this article: Turn on and use multi-currency.

Once done, you'll need to assign a foreign currency to a new customer

1. From the left menu, select Sales.
2. Select Customer, then New customer.
3. In the Customer information window, fill out the needed information.
4. Select Payment and billing.
5. In This customer pays me with field, select the customer's currency. This is the currency that the customer uses to pay you for products or services.
6. Select Save.

After that, let's go to the New (+) on the upper left side, then click Invoice and complete the needed information.  See the sample screenshot below:

Please check out this article: About Multicurrency. This link helps you on how to add a foreign currency account. And, you'll learn more about exchange rates in QBO.

You can always drop a comment below if you need more help from us. We're just right here to assist you.

@leotracey60-gmai 

Where is your company located?