Why the turtlebot3 OS for raspberry pi3B doesn't show any GUI?

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It's the password you use to connect to the wifi. The same that you would enter on a computer when you select the SSID. There is a guide here: https://linuxconfig.org/ubuntu-20-04-... that you can take a look at, if you're having problems

Thanks for your answer, I ran the tutorial but I don't even see my wlan0 when I run this command $ ls /sys/class/net

I've tried both the 50-cloud-init.yaml configuration of the Robotis page and the tutorial you mentioned, but it still doesn't work, how can I fix the lack of the wlan0 or wlp3s0 in my turtlebot?

It seems like this is more a Raspberry pi / Linux question than a ROS question. I suggest that you find a RPi forum like https://raspberrypi.stackexchange.com/ or a Ubuntu forum and post your question there.

It could but I've installed the regular raspberry Pi OS and I can use the WiFi and I can see my IP using ipconfig, but when I download the Raspberry-melodic OS it doesn't work, I don't know if it is the internet configuration, also I plug an ethernet cable an it works but I need it to be WiFi

I was about to download the Melodic image to see if I could get it to work and I see that there are 3 images to download. Pi3, Pi4 and a Pi4 image that is Raspberry Pi OS based. The first two are Ubuntu based. If you are using the last one, the wifi setup might be different than the instructions that works for Ubuntu based OS. A quick trip around google found this: https://raspberrypihq.com/how-to-conn... and it seems like it's a different file you need to edit with the SSID/Password. Also, there is the "sudo raspi-config" command that gives you a text-based UI. I have a Pi3 on my turtlebot and no spare Pi4 I can use, so I can't try it out. If the instructions I linked or raspi-confdig doesn't work, I'm out of ideas.

Thanks for your help, although I'm using the fist OS shown, beacause I have a Raspberry pi 3b+, I'll try the other two ones if those can work, but I don't know why but my Raspberry dosen't find the raspi-config command for some reason, although if you tried it already al check again if I can make it work. I'll check and update any details

Unfortunately it didn't work, also it doesn't work the raspi-config, when I type "sudo raspi-config" it returns command not found.