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Your first player in the list is the one who will strike the ball first. He can be used to drop the ball into the box or pass to a player on his left or right. By selecting this player in the designer screen, you can choose the following actions:
Shoot
The player will attempt a strike on goal. Success at this depends on the player's Set-piece ability and his Shooting ability. This will end the free kick, and no other players can be instructed.
Pass
The player will pass the ball - using the mouse select who/where the ball will be passed to. The recipient can be instructed to run to where the ball will be delivered.
Cross/chip
Best used on free kicks on the wings of the penalty area, a high Set-piece rating and Crossing rating are required. Choose either the player or the area you wish to cross to.
Wait for runners
This option sees your player hold on to the ball until a player running into the area makes some space to collect the ball.
Remove
This removes the player from the current step of the set-piece designer.

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The second player is introduced into the set-piece by selecting them as the recipient of a pass or cross. They can be given instructions such as run, hold position or they can be removed. Once added to the set-piece designer as an active player, they can be accessed in the step list in the top right corner, and from here be instructed to pass or shoot.
Players can be positioned around the penalty area or further down the pitch with instructions to run onto a pass from the free kick taker. If you choose this option it is a good idea to make the second player one with good ability at Long Shots because with the speed they have gained running towards the ball, a long strike will be powerful and accurate.
A third, fourth or even fifth player can be added to the set-piece. Beware making the free kick or corner over-complicated though.
Each step of the way, test the free kick or corner using the Practice Set-Piece button in the lower left of the screen. When you're happy with the set-piece, add it into your team's arsenal by checking the box next to its title at the top of the screen. Your players will be dying to try it out in the next match!