Once you have the positions added onto the pitch, you add your players to each positions. To do so, click the + on the player tab. You will be asked to import squad. Click Import Squad. Select the team by clicking on the league, club and then squad you want to use. The players from that squad will be added to a list. Click the check box next to the player to add them to that position. When you have finished, click the tick to confirm your selection.