So i connected it through HDMI. There's no audio, which cable do i need to make it work? It has an "Audio In" port, which cable do i need to use that port?
Shouldn't be. MacBook - audio out (headphone) | Monitor - audio in (I don't think it has audio out). You might check volume and mute on your MacBook and then their may be a setting on the monitor for audio since it has built-in speakers.