This feature is available in Premium Membership only. After entering My Expenses you will see a new icon of "@" which is placed next to the "add expense" button above the list of your expenses. Click on it, check the instructions and your dedicated email address will be visible. 
1. Add the email address from which your expenses will be sent to the app.
2. Send an email with attachment from the added address to the dedicated email address which is mentioned on the app (after clicking "@" button).
3. When the data is extracted from the expense document, you will get a push notification.
4. You need to check the added expense (because it is in draft status), edit it if needed and confirm. After that your expense will be booked and you can pay it or add it without payment