a.) Go to challenges (Desafíos) and you must have an invitation from the Panama International Marathon to the challenge you registered.
b.) On the screen it will appear that the International Marathon of Panama, invited you to participate in the challenge that you registered, whether it is 42KM or 21KM
c.) Accept the invitation to be part of the challenge.
d.) Finally you will see on the screen the days until the challenge begins, the countdown will be updated until zero hour is reached