The drivers page is where you can define the line-up of your main and youth team. This page also gives you an overview of all the drivers that are currently contracted to your team, and the drivers who are leaving or arriving next season and beyond.
The driver pool gives an overview of all the drivers that are currently contracted to your team. The table gives an overview of the most important information in regards to the driver and their contractual situation.
The season changes panel gives an overview of the changes for the next season by default. These changes can be a driver leaving the team, which is marked by out, or a driver joining the team, marked by in. It's possible to go further in the future by clicking Next season.
The line-ups section allows you to set your main and youth driver lineup. The main driver line up is quite important, as this defines who is able to qualify for the race weekend. The main driver roles can also be set here. If there is a driver preference, then the second driver will let the main driver passed very easily if the main driver is behind the second driver. If there is no driver preference, then both drivers will act as the main driver.
At the bottom you can set the youth driver line up. Make sure to double check this table regularly as drivers who are too old will move out of the role automatically.