In your formation you have to select your players of the special jobs.
This means you have to designate one player each to kick your free kicks, penalties and corner kicks.
Free kicks
There will most likely be a number of free kicks in just about any match you play. Free kicks are best kicked by a person with a high offensive skill.
The talent free kicks also gives a good chance of a goal when it triggers, so a player with a slightly lower skill and a free kick talent is usually the better choice.
Penalties
Here you set the player that will kick the penalty kicks after a foul in the match. Even though this does not happen as often as a free kick, the chance of success is much higher, so the selection should be done with thought. An player with a high offensive skill is a good penalty kicker.
The penalty kicker talent increases the chance of a goal even more when it triggers, so a player with a slightly lower skill and a free kick talent is usually the better choice.
Corner kicks
There will most likely also be quite a few corner kicks in your match. Corner kicks are best kicked by a person with a high passing skill.
The corner kick talent also gives a good chance of a goal when it triggers, so a player with a slightly lower skill and a free kick talent is usually the better choice.