Navigate to the activity where the session is

Click on the student who's analytics you want to view

Analytics will appear at the top of the session page.

From there you can change students' grades if you feel they deserve a different grade, or create a follow up activity

Navigate to the session analytics page by following the steps above

Click on share session at the top

Enter the email of the person you'd like to share the session analytics for

You can also find out who can see your students' sessions already by looking at the list of members who have access to it.