Email sent on opened order....

Can someone tell me where I could put some code to send an email of the invoice when an order is on “open” status?

I just don’t know where to go in the ‘template editor’ to change that.

In admin backend you can edit the order status;

check email and you can use wyiswyg to put whatever code you’ll like.

Hope this helps

Thanks, but I know I got to go there, but where exactly? What .tpl page should I edit for that?