Hello there, @laura89.
I'd be glad to help you change the name of your invoice template.
- Go to the Gear icon and select Custom Form Styles.

- If you'd like to modify an existing style, click Edit in the Action column. If not, click New style and choose Invoice.

- On the Content section, click the pencil icon on the top box.

- Under Form names, type in Pledge in the box beside Invoice.

- You can click Preview PDF to see the changes made, then click Done.
For additional details in customization of your template, check out this article: Customize Invoices, Estimates, and Sales Receipts.
Also, you may want to consider adding a logo on the sales form, which helps establish your company's brand and personality.
That should do it! Keep me posted for more QuickBooks questions. Have a great day ahead!