First you need to create a FUT Club which will net you the
achievement.
Next, either open packs until you are awarded a Chemistry Style consumable, or go search for and purchase one on the Transfer Market. The simply go to the Squads menu in FUT, select the squad containing the player you to apply the consumable towards, select that player, press X (Actions), then select A (Apply Consumable), find the Chemistry Style consumable and apply it. Simple.
This is also one the tasks required to get the
achievement.