Once you have signed up to Thumbnail.ws, you will receive an API key in your e-mail.
Click Add Key in your service group settings, search for Thumbnail.ws, specify a name, and click Save.
In the Keys page, where your key is now listed, click Authenticate.
Enter the key received in your e-mail in step 1 above and click Save.
Begin creating a new action in a script.
Search for screenshot to find the Thumbnail.ws action.
Fill out the inputs.
Assign the key that you created earlier.
Run the script and take note of the output in Transposit, showing a screenshot of the specified webpage.