guitar tuner electronic

How do I tune my acoustic guitar with its built in electronic tuner?

ok. theres a little box that will flash letters (E, A, C, G, B) and theres this symbol: # that will light up. and then theres the flat sign and another # sign pointing a middle dot. I know how to use that part but it’s the letters and # that are confusing me. help is much appreciated
for the B string: a b never shows up on the screen. and how come theres a C and an F if none of the strings are those notes?
theres a lowercase d too
and what does the box with the light up # mean

okay, so first you need to know the names of all the strings top to bottem is E,B,G,D,A,E. Strum your top E string and look at your tuner. the letter E should pop up and the little bar will do to the right or the left. if it go’s to the right it means you loosen your guitar string, if it goes to the left you tighten your string. You keep on doing that to your last string.

Oh, and if you strum say the b string and the srting sign comes up as say A then your guitar is REALLY out of tune.

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