The steps are as follows.

G54:
1.Combination key “HIGH/LOW”and “ON/OFF”is for changing tool
2.Press “RUN/PAUSE/DELETE”,choose “internal File”
3.Select the file we need
4.Set the working speed,better start slowly
G55:
1.Press “MENU”and “2”combination key,change coordinate from G54 to G55
2.Press “RUN/PAUSE/DELETE”,choose “internal File”
3.Select the file we need
4.Set the working speed,better start slowly
5.“Y+”and “Y-”is for adjusting the speed
G56:
1.Press “MENU”and “3”combination key,change coordinate from G55 to G56
2.Select the file we need
3.Set the working speed,better start slowly
4.“Y+”and “Y-”is for adjusting the speed
The video is as follow.