ITEAD Mega Proto Screw Shield - Problem soldering components

Hello everyone and thanks for reading this and (hopefully) for helping! :wink:

I've started to solder the shield I pointed in the subject but I had to stop when I had to deal with the left part of the shield, meaning all the column containing the xbee connectors since I couldn't find any tutorial and the schematic was no help to me.

Can anyone help me out with this?

Thanks in advance!