!! Imporant !!
There are already some new features in the latest version of the app that are not included in this demo version, and there are some features, like emailing an invoice from the app, that are removed entirely from this demo app.
Finally, this demo app will delete app of your data when you quit/close the app.
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You can read the Userguide here.
The Userguide does go over all the features in the latest version of the app, so it's a good idea to check that out too.
Here are a few tips to help get you started...
1. The first thing you should do is fill out your "Preferences". These are used to setup and "fast-fill" your invoices
2. Next you should add some products and/or services you commonly offer. These too are used to fast-fill your invoices
3. You can add new clients and customers to the Contacts app when you create a "New Invoice". After that you can use the Contacts app to fast-filled your invoices for them.