After a team has scored a try (including a penalty try), they are awarded a "conversion" kick at goal.
A successful kick is worth two points.
The kick is taken from a point in line with where the ball was grounded for the try, as near or as far from the goal-line as the kicker desires.
A conversion is successful if the ball goes between the opposition's goalposts and above the crossbar.
If the ball hits the posts, and bounces out, play does not continue.
The kicker may tee up the ball on sand, sawdust or an approved "tee" - or directly on the ground. And a team-mate (placer) is allowed to hold the ball - usually only if it is windy.
They have one minute from the time they have teed their ball up or placed it on the ground to make the kick or it will be disallowed.
The kicker's team-mates must be behind the ball when it's struck while the opposition must be behind the goal-line - though they can charge once he starts his run up.
If the ball falls over before the kicker begins his run up, the ref can allow it to be replaced.
But if the ball falls over after the kicker has begun their run up, he either has to kick the ball as it lies or pick it up and attempt a dropped goal.