By running it straight to any of the front row
In my case I played scrum half. At a scrum 5 I got the ball out of the scrum and dived over the try line. I scored the try but when I dived, I didn't see a flat stone underneath my left foot. As I dived, my studs slipped on the stone and my leg flicked back and I ruptured my Anterior Cruciate Ligament (ACL, very common injury) After a couple of months I was back playing but not for long - the injury kept reoccurring and it effectively stopped me going past the schoolboy level.
It's a contact sport so you are most likely to at some time. Just wear recommended protective gear and if your coach is any good he will coach you how to use the best body positioning when in different situations during the game. Listen to your coach!
Just watch this video it will show you some rugby injuries.
It's like football without protective gear.
