I come from Taizhou, Zhejiang. I first went to the local tax to buy a unified receipt, and then downloaded the latest ordinary invoice invoicing software online. After installation, the system defaults to super user with 6 passwords 1. After entering, I can import information according to the user name and password of the company's application materials, and then I can invoice normally. If I don't understand anything, I can call the tax service number: 12366.