How can change the invoice # that is set in quick books and writer my own on invoice?

Hi suhair1,

QuickBooks Online is designed with awesome features to make it easy for you to handle your business. Having the flexibility to edit your numbering system for your invoices is essential. I'll be happy to assist you with this.

QuickBooks automatically assigns numbers to your sales forms starting with 1001. If you'd rather use your numbering format, here's how to proceed. 

1. Go to the Gear icon then Account and Settings (or Company Settings).
2. Select the Sales tab, then click anywhere within the Sales form content section.
3. Check the box next to Custom transaction numbers.
4. Select Save and then Done.
5. Open an invoice or any sales form, and in the Invoice no. field, enter the custom number or letter sequence you want to use for your forms.

You can review these steps and learn more about how to change invoice number here: How to change the invoice number on sales forms

I hope this helps! Feel free to stop by anytime if you need anything else.