You can download SAP Concur from the App Store or Google Play Store.
Once downloaded, you will need to enter a company code in order to use the single sign-on functionality - this essentially means you can log in with your email address and password you use for your work PC/laptop.
Open the app on your phone and select 'SSO Company Code Sign In'
Enter the following company code: BPVDT2
Click on 'SIGN IN WITH SSO'.
Enter your work email address and password on the following screens and you will then be logged in to SAP Concur.
A video on the process is below.