Scan for I2C addresses: https://diyprojects.io/using-i2c-128x64-0-96-ssd1306-oled-display-arduino/#.Xn4zQ9NKh24
If you need more RAM, can use the Sparkfun library instead: https://github.com/sparkfun/SparkFun_Micro_OLED_Arduino_Library
Scan for I2C addresses: https://diyprojects.io/using-i2c-128x64-0-96-ssd1306-oled-display-arduino/#.Xn4zQ9NKh24
If you need more RAM, can use the Sparkfun library instead: https://github.com/sparkfun/SparkFun_Micro_OLED_Arduino_Library