The Invoice Simple app is designed to help you create your invoices and estimates on the go in a fast and easy way.
Once you open the app, you should see a blue round button on the Invoices tab that is used to create new invoices.
After pressing the button, the app should take you to Edit mode where you can fill out all the details of your invoice. Once you are done, you can switch to the Preview tab to see how your invoice looks like, and you can go back to Edit tab to continue editing the invoice. When you're happy with what you see, you can simply press the blue button at the bottom right to send your invoice.