Task: I have some Dollar cash, so I want to know how much 100 US dollars will be converted to in Euro currency, EUR, on the XE app.
Steps:
Open the Xe app
Click on the ADA dropdown
Click on the USD
Click on the ADA currency
Click on the ADA dropdown
Click on the EUR
Click on the USD section 
Click on the calculator icon
Click on the AC button
Click on the 1 button
Click on the 0 button
Click on the 0 button
Click on the done button