Login to your FireText account and get your API key.
Its available in Settings -> API
Find out the sender ID. Easiest way is to look in “**Send a Message**” tab
You can input these values into Spotipo by logging in the dashboard, and go to Settings-> SMS Gateway.
Select Firetext as SMS gateway and enter the Sender ID and API Key and save the configuration.
Optionally, this can be tested by entering a phone number and then send a Test SMS.