Your hotend heaters should be connected here. From left to right, the connectors are E1 and E0.
Polarity does not matter for hotend heaters.
WARNING: It is HIGHLY recommended to use the included ferrules, by crimping them to the wires before putting the wires in the terminal block. Failure to do so could allow the wires to creep over time, become loose, and could possibly short circuit and start a fire.
Do not tin (add solder to) these wires.
Be sure not to twist the terminal block while tightening the screws. It can help to hold the terminal block while tightening.
Check the screws after a few days/week of operation to ensure they are still snug.
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