Do you have a tuner? Just tune the open strings (don't fret them) to 440 pitch.
The whole fifth fret thing is when you are tuning by ear. For instance, if your sixth string (the big fat one!) is tuned to E, then the note sounded on the fifth fret of the sixth string (E string) would be equivalent to an A note. Which is what the next string up should be tuned to. Except for the G string, you would fret that on the fourth fret to get a B (which is what the second string is tuned to in standard pitch). Yeah, I know, that's a little confusing.
And you don't pull on the string from the fifth fret or whatever that means.