How do I add more info e.g address, contact no. to my invoice I create. On the top left of my invoice I create it says my company name and my email address. Thank you

Great to have you here in the Community, @isaacprestonn-ho. 

Adding your company address and contact details to your invoice is quick and easy. You can customise to add specific info to your sales forms. I'll show you how:

1. Go to the Settings menu, then select Custom form styles.
2. Click New style., then select Invoice in the dropdown menu. 
3. Go to the Content tab, then click the header on the sample form to start editing that section. 
4. Tick the box next to the Phone fields, then click +Address to enter your company address. 
5. Click Preview PDF to see how it looks, then click Done to save your changes.

You can visit this article to learn more about enriching the layout of your sales forms to make them more personalised: Customise invoices, estimates, and sales receipts in QuickBooks Online.

I'll always be here if you need more guidance in enhancing your invoice and other sales forms in QuickBooks Online.