help me please! (DIY spectrum analyzer)

hello
please help me in my project.
i am making a spectrum analyzer .i have a problem .my problem is about show lcd.
for exampel sampel1 show 1 line sample2 show 2 line or i want show charachter on lcd 2*16 i have a problem .my problem is this : how would my charachter? .
under link :
YouTube - The Fastest Acoustic Spectrum Analyzer on AVR M8 - new V2 !
show spectrum analyzer with avr but these charachter can chang .

Character LCDs have eight programmable characters. That's how the vertical bars are created. That's also a VFD display.

thanks you
pleas more explain how to display character vfd for output fft function and example thank u