If you ordered a fully-assembled m3pi robot, your m3pi expansion board and the included 3pi robot are already populated with all of the standard components except for the Wixel socket headers, because these would interfere with the XBee socket. If you want to use a Wixel, please see the Wixel Socket portion of Section 2.a. Otherwise, you can skip this section and move on to using your m3pi robot!
Note: Assemby of the m3pi expansion kit into an m3pi robot requires soldering. No soldering is required if you order the fully-assembled m3pi robot.