Swim.com app won't allow me to change privacy settings. Help?

I would like to enter a fitness challenge, so I downloaded the Swim.com app.  I am trying to change my privacy settings to enter the challenge, however, the app won't let me.  When I click on "New Swim," "Public" is in gray and I am unable to click on it.  "Private" seems to be my only option, even though my profile is not private. Will you please help?  Thanks!