To make an expense report, first of all, you have to activate the module Expenses in your Back Office.
If you will access your Back Office from your iPad, you simply go to Settings ⚙️> BackOffice, in the case you will access with your computer, open your browser and type: https://app.tillersystems.com/
On your Back Office click on Configuration > Your modules > Data Analysis > Expenses.
Once the Expenses module is activated. Click on the Transactions tab. Subsequently, click on Expenses. You will be able to find your expenses and export them into a CSV file. In order to find a specific date or period of time click on the date tab (upper right corner).