Q1 >Facing problem with Audio in Live meeting?
Click on Voice & Video on your menu & click Join Audio.
This should solve your problem. If not try again else disconnect from Live meeting and join again.
Q2 > How to ask question when you don’t have microphone with you?
Type your question in the Q&A block.
Q3 > How to share the screen?
You will be able to share your screen only if you are given rights of Presenter.