You should register your family/parent on the site. Then you will be able to use that username and password to register individual children for specific sports activities.
When registering a player, if you get the message "No programs available", this means one of two things. The players age is outside the range for any programs. (too young or too old for available programs) or the registration period has closed for that program. You can still contact the individual BAA Sports Directors if you have missed the registration period.