SXT Lite 2 - setup to expand the wifi signal

Hello all,
I just purchased a new Mikrotik SXT Lite 2 and want it to do a simple job, to expand my wifi signal. How can I do that? I already brought the cable to the point where it should be and send the signal, but since I am really new in this one, I don’t know where to begun. I already installed winbox. Can anybody help me to adjust this to play as antenna.
Thanx