This receiver is PPM capable, so you just have to :
1/ enable this mode in the receiver (do not have this radio so don't know how to do it...)
2/ plug channel 1 (of the receiver) to the three pins labels "Gnd" "+" "RCVR" on the seppuku.
3/ plug each motor 1to the pins labeled "GND" "1", motor 2 to "GND" "2", etc... You only use black and white wires from the ESC (black is ground)
4/ if at least one of your esc has bec, take the red wire and solder it to the "+5v" pin. If the 5 ESCs do have bec, you only use one of their red wires and discard the three remaining ones! If none of them has a bec, just add a separated UBEC and plug it to "GND" "+5v"
That's for the most basic setup...