Welcome! So sorry about the broken leg -- yow, that is rough!
Good news, though, I think you can get alot done weight-loss wise without exercise, particularly at the beginning of the process! All your hard work will be done in the kitchen and in your head. I always say that, for me, weight loss is 90% food management, 10% attitude, and 5% exercise. For 105% effort.
As Bill pointed out, there is an Atkins sub-forum, lots of great people in there to give you support!