buy esp8266 board by yawot.com
1.your wifi &hotspot ssid & pass write on arduino code file.
2.Creat thingspeak account.
3.download & upload esp8266 code into your board.
4.after upload open arduino serial page and press reset button when connect it will show to serial page .
5.write thingspeak write key on my webpage to on off devices anywhere in the world.
Control Your Devices Anywhere In The World Using ESP8266, Matlab Thingspeak
YAWOT IOT CONTROL WebPage