Turn on and off led bulb

I am trying to turn off and on a single led bulb using the D2 pin on blynk platform. But after clicking on, the button does not switch to on but the bulb turns on. Then it cannot turn off the bulb afterwards no matter how much I click.

I’d suggest that you read this link…

then edit your post (using the pencil icon at the bottom) and provide significantly more information.