Sign in from your laptop or desktop computer.
You'll see the green "Lesson" button in the top right corner of your screen.
Click it to see the active lesson and "Join".

Or you can go to "Tutor studio" > "Private lesson" > "Join".

If you can’t host a lesson on LiveXP for some reason, use Zoom, Skype, etc. Ask the learner to rate it on LiveXP afterwards.