Guest 2VNN0Y :
Thx a mil ,I am new in the game (Luderitz Catfish)
Good sign. You are asking the most important question early on. Subbing is absolutely key to doing well in this game. Keep doing it and training as often as you physically can.
BTW, in case you were wondering, unlike real rugby you can only sub 7 players. Injuries are subbed automatically in addition to this 7.