How to set home position in the middle of the bad in Marlin 1.1.0-RC7

Hi Guys

I don't know how to set home point. My command g28 finish in this position

ttyUSB3 PC> m114
SENDING:M114
X:64.00 Y:159.00 Z:15.00 E:0.00 Count X: 6018 Y:15013 Z:5929


my configuration.h looks like
#define MANUAL_X_HOME_POS 100
#define MANUAL_Y_HOME_POS 100
#define MANUAL_Z_HOME_POS 15