If you've created a session, there's lots of different ways to access your session from the different parts of the site.
If you would like to access all sessions you have created and joined, you can view the full list in your "Sessions" tab. You can access this feature by clicking "Sessions" in the top right-hand corner navigational bar of any Academia window. Clicking this button will provide you a full list of every session you have created or joined.
Alternately, if you are on a profile that has a paper with a session attached, you can join or ask to join that session by clicking "View Comments" under the name of the paper