Nikon D3400 Two Lens Kit Owner's Manual

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The Shooting Menu: Shooting Options
Choose the flash mode for the built-in flash in PSA, and M 
modes. When an optional SB-500, SB-400, or SB-300 flash unit is 
attached and turned on, this option changes to Optional flash 
and is used to choose the flash mode for the optional flash unit.
Flash Cntrl for Built-in Flash/Optional Flash
G button
➜ C shooting menu
Option
Description
TTL
Flash output is adjusted automatically in response to 
shooting conditions.
Manual
Choose a flash level. At full power, the built-in flash has 
a Guide Number of approximately 8/26 (m/ft., ISO 100, 
20 °C/68 °F).
A
Manual
Y icon flashes in the viewfinder and 0 
appears in the information display when 
Manual is selected and the flash is raised.