What do I do if a player is about to break a batting or bowling rule?

General Rules 3.2(d): if a scorer notices a breach of the bowling or batting rules, they must immediately interrupt play (they must not wait until the end of the over) and:

1. Advise the umpires that a player is about to breach a bowling or batting rule.
2. If the breach is in the bowling, the over is completed by another bowler who will not breach any bowling rule.
3. If the breach is in the batting, the batter must retire immediately.

Scorers are treated as match officials. At a minimum they should know the umpire signals such as wide, the types of dismissal, the batting retirement rules and the number of overs bowled per player.