Good day, chetver.
To fill out the W-9 form, your client will send you an email. What you need to do is click the Add your details now, so you’ll be asked to enter the information or create a free QuickBooks Self-Employed account if you don't have one.
You can check out the details here: 1099s in QuickBooks Self-Employed.
I'll be around if you need more help with the W-9 form. Stay safe.
