To use the service, simply continue with a Google Account by clicking the "Login with Google" button below. We never know your Google password, everything you do will be on Google's website. If you haven't subscribed for the trial, you will be asked to do so. It's free for the first 7 days and you can cancel at any time without being charged.
On the main screen:
Enter the phone number you want to send SMS to in To Number text box.
Enter the message in Message text box.
Check the captcha.
Finally click Send and the number should receive the SMS soon!