When I chord out songs, I use dashes to represent chords in which you play all the notes at the sam time. Example:
C / C-E-G *play all 4 notes at the same time
I use commas to represent single notes in which u play each note one at a time. Example:
/ C, D, Eb *play the C first, then the D, then the Eb
Others do it differently. To be absolutely sure, u can just pm the chord poster on how to play the chords or you can listen to the song while u follow along with the posted chords to get your answer.