Use IFTTT trigger for sonoff switch

Thank you Ken.
Now I have to create a trigger in IFTTT…
I login in IFTTT,

  1. choose New Applet
  2. choose the service eWeLink
  3. choose the trigger “1 channel switch turn on or off”
  4. set the name_sensor and turned “on”
  5. and then… what action I should choose???