Canon EOS REBEL T7i Instruction Manual page 208

D Using the Built-in Flash
If the subject is too far away and the captured image comes out dark, the

<D> icon will blink. Move closer to the subject and repeat steps 2 to 4.
FE lock is not possible during Live View shooting.

208
Take the picture.
4
Compose the shot and press the

shutter button completely.

The flash is fired, and the picture is
taken.