First, find your sitting posture. Avoid lying down, or you might fall asleep very soon! Make yourself comfortable. It needs to be comfortable enough, but not too comfortable so you are not falling asleep.
You can simply sit in Sukhasana, Put as many cushions as needed underneath your bum and knees.
If you are comfortable, you can sit in Siddhasana. Bring one foot between your chin and your tie.
If you are comfortable and super flexible, you can sit in Padmasana, the famous lotus posture!
If this does not feel comfortable, do not worry! You can of course sit on a chair. Try having both feet planted on the ground.
Your hands can be palms facing down, to be more grounded, or palms facing up, to feel lighter.