First, press the reset button the control panel. This will ensure that the extruder stepper is powered down. You can't easily turn it if it's active.

Press in the knob on the control panel and turn it to select the Adjust Temps menu item. Press the knob in to select it.

Turn the knob to the NOZ Temp and push it in to select, then rotate the knob clockwise to increase the temperature. Set the temperature to what you normally print the loaded filament with.

Push the knob in to "commit" the value you set.