Lay Kippah and Powerboost 1000c on the enclosure to get an idea of wire length. A bit of extra slack is OK, you can shorten it later. 26AWG silicone-coated stranded wire is recommend for power.
Tin Kippah and Wires
Strip and tin the two wires then, apply solder to the 5V and GND pins on the Kippah.
Appy heat to the solder joints on Kippah and place the tip of the wires to the 5V and GND pads.