Can anyone help me I have marked a invoice as paid how do I change this on a iPad

I can help you change the invoice that's marked as paid using your iPad, @classiccurtains.

You can find and delete the invoice payment that marks the invoice as paid in the Invoice Payments section of the Sales menu.

Here's how:

1. From the Menu ☰, select Sales.
2. Tap the drop-down arrow ▼ from the filter options, then choose Invoice Payments.
3. Choose the payment you want to delete.
4. Tap More Options ⋮, then hit  Delete.

Alternatively, you can use a web browser like Google Chrome and Mozilla Firefox to log in to QuickBooks Online. From there, you can follow these steps to ensure that you're deleting the correct invoice payment:

1. Go to the Sales menu and then select Invoices.
2. Find the invoice in question.
3. From the Action column, click the Triangle button and then hit View/Edit.
   
4. Select the 1 payment made link, then click the date.
   
5. Scroll down and then select More to choose Delete.
   
6. Hit Yes to confirm.

Well done! You know now how to remove the payment made in an invoice via iPad and web browser.

In case you want to learn more about adding specific notes to your sales forms using an iOS device, here's the right article you can look up: Add a note to a transaction in the QuickBooks Online app.

As always, feel free to come and leave a comment here if you need further assistance with your invoices. I'll make sure to help you all the way. Stay safe, and have a great weekend!