Cut the header down to length if necessary. It will be easier to solder if you insert it into a breadboard - long pins down
Add the E-Ink Display
Place the board over the pins so that the short pins poke through the top of the breakout pads
Be sure to solder all pins for reliable electrical contact.
(For tips on soldering, be sure to check out the Guide to Excellent Soldering).
OK, you're done!