As a Coachee/Mentee, to notify the Coach/Mentor that you need to change a session, click on 'Community' then 'My Connections'.
Click on 'Message' next to the name of the Coach/Coachee.
The 'To' will have their name in, type in a 'Subject' and your message and click 'Send'.
Please note: only Coaches/Mentors can change the session details within the system.