How can I redirect sound coming in from the mic to the speakers output

How can I redirect sound coming in from the mic to the speakers output

"I can record sounds using my mic, however I cannot hear my voice through the speakers.
I have a realtek card (I have a ACER one notebook).
I have been reading a lot of information in the web but I cant make it work.
I am missing something? (is not a problem of volume or mute)."