FPC connector to DIP
You solder it with steady hands. 


  Its just the solder holding it in place?


Solder would be enough to hold the connector, if you are gentle with it and don't yank it around too much. After all, that's how the FPC connector on the other end of the cable is attached to its board. You can also add a drop of epoxy or hot melt glue to help secure the connector. 

Keep in mind that this board is only a kludging aid. In production boards, there are additional large SMT pads on each end of the connector to hold it down more securely.