Option 1: On main level: Administration > Task Manager > Click on the green + button
Option 2: On team level: Tasks > Click on the green + button
Option 3: On athlete level: Tasks > Click on the green + button
Based on the level you start to create it from, different fields will be prefilled already.
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.