I need an Arduino engineer or programmer

I'm using an Arduino uno, esp8266 Wi-Fi module chip, Mq135 sensor, and DHT11 sensor. I want the Arduino uno to be the microcontroller and read the data from sensor and using the Wi-Fi module to send it to a website called Thingspeak. I already did the part for Wi-Fi module and DHT11 but i don't know how to modify the code for MQ135. below I attached the code used.