1. Navigate to the channel where you want to add the webhook and select (•••) More Options from the top navigation bar.
  2. Choose Manage team from the drop-down menu. Then click Apps tab.
  3. Click More apps button and search for Incoming Webhook.
  4. Click Add to a team button.
  5. Select a channel then click Set up a connector button.
  6. Provide a name, and, optionally, upload an image avatar for your webhook then click Create.
  7. The dialog window will present a unique URL that will map to the channel. Make sure that you copy and save the URL
  8. Select the Done button. The webhook will be available in the team channel.