Welcome to 3FC! You're off to a great start! Congrats on losing 19 pounds!
Find a group you'd like to join, and just hop on in!
You're welcome to join us on the Chicks Up For A Challenge board under Clubs and Groups. We're in the 12 Week Habit-Forming Challenge. You can just start where you are. Or there are many other challenges available in many different groups with many different goals. There's bound to be one that works for you. Or you can create your own.
As for how they work, most challenges work by setting up a goal at the beginning of the challenge, or everyone posting individual goals, then everyone posting their progress on a daily or weekly basis.
If you have any other questions, don't hesitate to ask. Or you can Private Message (PM) me (click my name to the left of this post--it will open a menu).
Hope this helps!
I'm not aiming for skinny, I'm just aiming for happy.