To send SMS using Synerise, you need to integrate with one of third party solutions listed below.
To use Synerise in SMS campaigns fill in you SMSAPI username and API Password in Synerise Integrations module. Note that this is not your password to SMSAPI account, but a special one which should be generated at SMSAPI account administration page.
You can also use Twilio as a SMS sender provider. Go to Synerise Settings, then choose Integrations and fill inputs with Account SID and Account Secret.
You can also choose Materna as a SMS provider. Simply visit Integrations and fill form.
Check out how you can use SMSes!