To be able to send SMS campaigns, you must have a Sarbacane Campaigns license and SMS routing credits.
If you have a Sarbacane Campaigns license but you do not (or no longer) have routing credits, you will still be able to create an SMS campaign, but you will not be able to send it.
You can view your routing credit balance from the settings of your Sarbacane account, then scroll down to the Consumption section at the bottom of the page
If you do not have any credits, you can purchase them by clicking directly on the Edit button if you wish to change the number of credits included in your monthly or annual subscription, or on Top-up pack if this is an occasional need that does not necessarily have to be renewed each time your subscription is renewed.
Your credits will be made available to you once your order has been confirmed. You will then be able to send your SMS campaigns.