I don't know if there is a correct way to introduce yourself.
I just signed up today for this program, so I am also new.
Very sorry for the loss of your child. I think that it is good that you are taking this step, are you able to involve your wife (if she is ready for it?)
It's hard when you can't help your partner, feelings aren't fixable though, we have to struggle through them. You would be surprised how much the little things can help without you even realizing it. She may have a completely different idea of what "help" means to her as well.
Well, welcome and hello!