Welcome to Fleaflicker! We hope you enjoy the site.
We don't currently support the changing of league formats after the league is created, but I went ahead and changed it manually for you, along with all the changes you made to the roster rules and scoring rules. Here is your new H2H league that I mirrored along with the teams that joined already (I added them): fleaflicker.com
If you invited anyone to your old league, you'll just have to send them the new league invite here: fleaflicker.com
Thanks and let me know if there's anything else we can do for you.