If you have an athlete you want to do an Age Up (they compete in an older age group than they usually belong too, follow these steps.
1. After logging into centreadmin click on Event - Calendar
2. Then click on the View icon for the event date you want to add the age up the athlete to
3. Then click on the List view button
4. Then find the Age/Gender/Event you want to add the younger athlete too and click on the edit icon
5. Then click on the Manage Event Athletes button
6. Then find the athlete from the full list of athletes you want to add and tick the box and press the submit button