First I apologize, I missed one crucial point in your very first post.
You're using a GoPiGo3 as seen in the photo.
However you were using the gopigo library
You need to use
import gopigo3, or
import easygopigo3 (this one gives you easier to use commands, so it depends on your level of expertise and your goals)
You say there wasn't a ~/Dexter/GoPiGo3 folder. Did you get an SD card with the kit or are you using an old one? Either way, your card seems not up to date. I would recommend doing a DI Software Update. It will probably take a long time as the Raspberry Pi Foundation has done some extensive changes in the last couple of months and the Software Update will make sure you get them all (security updates, new editors...)
As the GoPiGo3 folder is now on your card, did you try the Read_Info.py program ?