Question about FB Plus membership

Hi,

I took out membership yesterday for a month. Today, I added FB Plus April Challenge: FB Fit, to my calendar my the few days left in the month.

Question - Does that mean that I follow the FB Fit program, which costs $18.99, but it said Free with FB Plus.

When I go to access the challenge, it explains the challenge, but doesn't take me to the workout.

I'm confused??

Help, Nick