How can I add my logo So it's on my invoices

I can gladly show you how to add a logo to your invoice, @andrew-ellis35-g.

A well-designed logo helps establish the company's brand and personality. Take note also that the logo should be of the following factor:

• a .gif, .bmp, .png, .jpg, .jpe, or .jpeg file
• smaller than 10 MB24-bits 
• less in bit depth (or colour depth)square-shaped, since rectangles don’t work using the standard RGB colour space.

Then, to attach a logo here's what you need to do:

1. Proceed to the Gear icon on the toolbar.
2. Under Your Company, choose Custom Form Styles.
3. At the upper right, from the New style dropdown, select invoice.
4. Note: If you want to upload a logo on an existing template, find the template then select Edit under the Action column.
5. Go to the Design tab, then click Add your unique logo.
6. Choose the box with Add a logo +, then the + on the next window.
7. Locate and click the image you want to use.
8. Select Open. 
9. Once uploading is done, select Save, then Done.

If you wish to customise or remove the logo, you can utilize this resource for the detailed steps: Add, customise, or remove logos on sales forms.

Additionally, I've attached an article you can use as your reference to help personalise and add specific info to your sales forms: Customise invoices, estimates, and sales receipts in QuickBooks Online.

That should do it! Keep in touch if you have further concerns about adding a logo to your invoices in QuickBooks. I'll be happy to help you always. Have a great day!