Thanks for reply!
I took a way the space in the Duet3 name.
I sent the G code commands, i hope I got it right.
See pic and config.g text below.

; Configuration file for Duet 3 (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.0 on Fri Jan 01 2021 15:40:18 GMT+0100 (centraleuropeisk normaltid)

; General preferences
G21
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"Duet3" ; set printer name

; Drives
M569 P0.0 S1 ; physical drive 0.0 goes forwards
M569 P0.1 S1 ; physical drive 0.1 goes forwards
M569 P0.2 S1 ; physical drive 0.2 goes forwards
M584 X0.0 Y0.1 Z0.2 ; set drive mapping
M350 X16 Y16 Z16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 ; set steps per mm
M566 X900.00 Y900.00 Z60.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 ; set accelerations (mm/s^2)
M906 X3000 Y3000 Z3000 ; set motor currents (mA)
M84 S0 ; Disable motor idle current reduction

; Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X230 Y210 Z200 S0 ; set axis maxima

; Endstops
M574 X1 S1 P"io0.in" ; configure active-high endstop for low end on X via pin io0.in
M574 Y1 S1 P"io1.in" ; configure active-high endstop for low end on Y via pin io1.in
M574 Z1 S1 P"io2.in" ; configure active-high endstop for low end on Z via pin io2.in

; Z-Probe
M558 P0 H5 F120 T6000 ; disable Z probe but set dive height, probe speed and travel speed
M557 X15:215 Y15:195 S20 ; define mesh grid

; Heaters

; Fans

; Tools

; Custom settings are not defined

I have a Duet3 board connected to a Rapsberry pi 4.
The pi is connected to keyboard and computer screen.

I can start the Duet web control and I get a message that it connects to the Duet3 board, but I cant get axes to show.

I feel that Im a bit out on deep water, my plan was to learn along the way, but now Im stuck.

It would be very helpful if some on could giv me a hint on what could be wrong or were I can find mor info.

See pics of web control and config.g below.
I tried to make the config as simple as possible just to test a stepper motor.