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Launch Fortnite and log in with the primary player's account to the game's main lobby
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When asked for, turn on the second controller and log into the second player's account.
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At the bottom of the screen, press the relevant Triangle button (PlayStation) or Y button (Xbox). This will sign Player Two into the game and add them to the lobby.
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Congratulate yourself! Both players should now appear in the lobby, ready to begin their split-screen Fortnite experience.
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Only the PlayStation and Xbox consoles now offer split-screen mode.
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Unfortunately, split-screen functionality in Fortnite does not yet support PC, Nintendo Switch, or mobile platforms.
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