Do you have a question about the Logitech K750r and is the answer not in the manual?
Connect the Unifying receiver to a computer USB port.
Pull the tab to activate the keyboard.
Power on the keyboard to begin using it.
Use enhanced F-keys by pressing FN key then the desired F-key.
Application zone keys (F1-F4) launch specific programs like home or calculator.
Multimedia navigation keys (F5-F8) control media playback and track skipping.
Multimedia volume keys (F9-F12) control audio mute and volume levels.
The FN key is used in combination with F-keys to access secondary functions.
The Light-check hot key indicates the keyboard's current light and energy status.
The power switch controls the on/off state of the keyboard.