Basil,
If I missed 2 days last week, am I supposed to play them now? I have been afraid to log in and just play for fear it will break the one a day rule....how do I "catch up"?

YOu can skip as many days as you want as long as you are able to finish by the rally finish date. YOu don't have to play one leg every day - its just that you can't play more than one leg on any given day. So you could play a leg on Monday and play the next leg on Tuesday or Wednesday or Saturday, etc.