All starters have a dedicated hot terminal. That is what the huge cable that goes directly from the battery to the starter is for.
You need two connections. The huge cable directly to the battery, and a smaller wire to the solenoid that, when the ignition switch is turned to position two, initiates the starter. Look at the picture you posted and try to identify the colors of two wires. They appear to me to be black and black/red. But double check this before referring to your wiring diagram. Once you know the colors, they should correspond to a wiring code or legend in the diagram. Best guess is that the black/red wire is the wire to the coil. See if the diagram confirms this. Alternatively, you can check this by sorting through the wires to the coil and when you find a black/red one near the coil, check for continuity with a multimeter to the red/black wire near the starter. This then would be the wire you do not use.