How can my students see how many XP they have earned? I'm new to this and don't know how to help!
The all-time total XP per language is shown on the profile page, on the right.
For you this is: https://www.duolingo.com/jfrave Your total XP for Spanish is 1850.
You can access your profile from the drop down, to the right of your profile icon image, in the blue web site header menu bar. Just select 'Your profile' in the drop down. Alternatively, just click on your profile icon image, to go straight there.