Hi @2231puppy! To “reset”/fix your issues you would need to rewrite the operating system to your SD card, no worries it is super simple. However you will need one program to do it. So first you need to decide on which OS to use. It sounds like you currently are using Raspbian. Because you are new I recommend trying Raspbian for Robots because it has everything you need to get started with your GoPiGo2. Raspbian for Robots is also created by Dexter Industries. (Some software like Minecraft won’t come with it though, but you can install that stuff later.)
Install Raspbian for Robots
Dexter Industries had a nice tutorial on how to do it.
Same steps as above except you’ll use the Raspbian image.
Go to the link and select Raspbian Jessie with Desktop.
You will also need to set up your GoPiGo2 on there. So after booting up run in the terminal
gt clone https://github.com/DexterInd/GoPiGo.git after that complete type
cd GoPiGo/Setup/ That brings you into the setup directory. To install type
chmod +x install.sh && ./install.sh Reboot and you should be good to go! If this is all too complex just use Raspbian For Robots.
Last resort, buy new SD card
You can also just buy a new SD card, but I don’t recommend this. Why? Well every single time your SD card get’s corrupt, you forget your password, etc … That’s a lot of wasted money … Regardless you can buy the Raspbian for Robot image here. and just one of the places you can get a Raspbian SD card is Adafruit
There is also Amazon if course and other places too.
If you don’t understand something I said just ask. My instructions may have been to dense.
How to Recover Password.
If possible I would try this before redoing your SD card.
First the default password for Raspbian is “raspberry” and the default password for Raspbian for Robots is “robots123” Secure right! Anyways if you didn’t change the password try those. If that doesn’t work does your Pi boot to the desktop? If it does open a terminal and type
sudo passed pi it will then prompt you to reset he password. If your pi doesn’t boot to the desktop try this tutorial to reset your password:
How to Fix WiFi
Not sure exactly what your issue with the WiFi is, but you don’t need the adapter.
Whichever OS you decide to use, this tutorial still applies: https://www.raspberrypi.org/documentation/configuration/wireless/pixel-desktop.md
I hope that answers all your questions, if there was anything that didn’t work or something I didn’t explain well just ask.
Have fun with your GoPiGo2!!