I'm delighted to welcome you to the Community forum, Jackson! If you need to modify a sales tax payment, you can easily do so by deleting and re-entering the payment. I'm here to guide you through the steps to efficiently manage this task.
In QuickBooks Online (QBO), if you've recorded a sales tax payment but forgot to include information in the memo field, you have the option to correct it. Below are the steps to update your sales tax payment:
1. Navigate to Taxes, then Sales Tax.
2. Locate the sales tax you wish to edit and go to Review sales tax.

3. Click on the payment date and then Delete.

After deleting the payment, you can proceed to re-record it and add the necessary memo details before saving the changes.
Moreover, I've added this article for your future reference in case you want to adjust your sales taxes in QuickBooks: Create or delete a sales tax adjustment in QuickBooks Online.
By following the steps above, you will ensure that your sales tax payments in QBO are up-to-date and accurately reflected in your financial reports. If you have any more questions, please don't hesitate to reach out. Here in the Community forum, we're always ready to assist you with any queries or guidance you require. Have a wonderful day!