more detailed:
Article 4: Single Point or Rouge
If the ball is kicked into the goal area by an opponent, a rouge is scored (1) when the ball becomes dead in possession of a team in its own goal area or (2) when the ball touches or crosses the deadline, or a side-line-in-goal, and touches the ground, a player, or some object beyond these lines.
AR Team A kicks to Team B. B1 attempting to catch the ball on Team B 3 yard line, fumbles it and is tackled with the ball in possession in the Team B goal area. Ruling - rouge (ball deemed to have been kicked into goal area by Team A).
AR Team A kicks to Team B. B1 catches the ball in the field of play while moving towards own goal line and, in the judgment of the official, the momentum carries B1 into own goal area. Ruling - possession deemed to have been gained in the goal area.
After a rouge the team scored against shall next put the ball into play by a scrimmage as first down at any point between the hash marks on its 35-yard line.
If the single point was scored as the result of an unsuccessful field goal attempt the team scored against may elect to scrimmage the ball at any point between the hash marks on its own 35 yard line or at the previous line of scrimmage.
Note: For the purposes of this Article a drop kick or place kick shall, without exception, be deemed to be a field goal attempt.
Note: If during a kickoff the kicked ball proceeds through the goal area and across the deadline or sideline in goal without being touched there shall be no score and the ball shall be awarded to the receiving team at any point between the hash marks on its own 25-yard line.
Article 5: Convert
A team scoring a touchdown may attempt to add to its score by means of a scrimmage play from any point between the hash marks on or outside the opponent's five yard line, as follows:
1 point - By kicking a field goal.
or
2 points - By scoring a touchdown by means of a ball carrying or passing play.
The ball shall remain in play until a score is made or the play has been terminated.
If Team B legally gains possession during an unsuccessful convert attempt (i.e. interception of forward pass, recovery of fumble or blocked kick), it may score two points by advancing the ball across Team A's goal line. If the play terminates with Team B in possession in its own goal area, there shall be no score.
If the play terminates with Team A legally in possession in Team B's goal area, Team A shall be awarded two points if the ball had been carried or passed across the line of scrimmage, but no points if the ball had been kicked across the line of scrimmage.
Note: For infraction on convert attempt, see Rule 8, Section 5.
There shall be no convert attempt on the winning touchdown scored in overtime