1/ Edit the seasonal Team by clicking on the three dots, and select 'Edit':



2/ Click on the 2nd tab 'Season athletes', and click on the green + button to add new: 



3/ Add by selecting existing athletes from the dropdown in 'Athlete'. 

Or create new athletes by clicking on the green + button


General info: user functionalities depend on the roles & permissions settings. If a certain functionality does not work within your user account, this will be because you don't have sufficient permissions for this.