Updated guides have been published for the different sizes of eInk Breakouts, Shields, and FeatherWings:

• Adafruit 1.54" eInk Display Breakouts
• Adafruit 2.13" eInk Display Breakouts and FeatherWings
• Adafruit 2.7" eInk Display Breakouts and Shields
• Adafruit 2.9" eInk Display Breakouts and FeatherWings

FeatherWing Connection

FeatherWing usage is easy, simply plug your Feather into the Wing