Sign in from your laptop, desktop computer, or the app if you are an IOS user and click "Join" in a toast notification that appears in the bottom left corner of your screen:

Or, 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 student to rate it on LiveXP afterwards.