Anyone who knows the link to your competition can register, see any released workouts, and enter their scores.
If you'd like to additionally show competition workouts on athletes' timelines, e.g. as part of your regular programming, you can do so.
On the competition details screen, select which programs you want your workouts to be displayed for:
In your workout, specify the 'workout dates'. The workout will show up on athlete timelines during these dates:
In the example above, the workout will be visible on your competition page on January 1st. Anyone can see the workout, and start entering their scores.
On January 4th, the workout will be shown on athlete timelines as their programming for that day.
Finally, January 5th is the deadline for people to submit their scores.
This is what the athlete will see on their timeline on January 4th: