git clone https://github.com/the-raspberry-pi-guy/lcd



cd lcd



sudo sh install.sh



rpi will auto reboot



after reboot     



cd lcd


edit lcddriver.py to ensure theat ADDRESS = 0x27 is the corect address (some are 0x20)




info from youtube, search
Raspberry Pi - Mini LCD Display Tutorial
by 

TheRaspberryPiGuy