If you are getting low on SMS messages and need to purchase more, here's how:
Click the Add-Ons icon on the side-menu to open the Add-Ons page:
On the SMS tile, click the Purchase button
Pick the SMS Package you wish to order (e.g., 50, 100, 300 messages).
Click Purchase to proceed to the Checkout.
Follow the onscreen steps of the Checkout to complete your purchase.
You should see the following confirmation message in the top right when your transaction is complete and the SMS package has been added to your account:
