Where does the FAN operation set up in SETUP?

I connected the power control-4-channel ssr-RJ45 cable, and I connected the FAN to GPIO26 and set it on which menu in SETUP? For example, operate when the temperature is above 30 degrees and humidity is above 80 percent

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The 3.3 volt signal from the GPIO switches the relay on and off. This can be set up on the Outputs page with the GPIO On/Off Output. Your fan will plug into the outlet controlled by the relay. Then you can control the fan from the Output in Mycodo.