To configure your GRBL based board, you need to be connected with LaserWeb or a terminal program.
In LaserWeb, you can send commands manually with the command line on the bottom right of the screen. After typing in the command, you have to press ENTER to send it to GRBL.

Send $$ to get a list of the actual configuration. To set a param you have to send $num=val (ex. $10=0).

Make sure the following params are set (matching your machine):

$10=0      ;send work coordinates in statusReport (needed for LW4!)
$3=3       ;invert X and Y stepper direction
$5=1       ;endstopps are NC (normaly closed)
$22=1      ;activate homing
$23=1      ;homing in X- and Y+ direction
$30=1000   ;max. S-value for Laser-PWM
$31=0      ;min. S-value
$32=1      ;Laser Mode on
$33=5000   ;PWM frequency 5000 Hz (lower = better grayscale, higher = better cut)
$100=160   ;steps/mm in X, depending on your pulleys and microsteps
$101=160   ;steps/mm in Y, depending on your pulleys and microsteps
$102=160   ;steps/mm in Z, depending on your pulleys and microsteps
$110=24000 ;max. rate mm/min in X, depending on your system
$111=24000 ;max. rate mm/min in Y, depending on your system
$112=24000 ;max. rate mm/min in Z, depending on your system
$120=2500  ;acceleration mm/s^2 in X, depending on your system
$121=2500  ;acceleration mm/s^2 in Y, depending on your system
$122=2500  ;acceleration mm/s^2 in Z, depending on your system
$130=300   ;max. travel mm in X, depending on your system
$131=200   ;max. travel mm in Y, depending on your system
$132=50    ;max. travel mm in Z, depending on your system
$140=0.4   ;X stepper current 0.4A
$141=0.6   ;Y stepper current 0.6A
$142=0.0   ;Z stepper current 0.0A

$$         ;to check the actual settings

These settings are an example of a K40 system. See https://github.com/gnea/grbl/blob/master/doc/markdown/settings.md for more details.

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