First login to your Twilio Dashboard to retrieve Account SID and Auth Token
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Next get a valid sender ID. Note: You will need to purchase at least one Phone number from Twilio to be able to send SMS.
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Go to the Phone numbers tab on the left and take one of your purchased number as sender ID.
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You can input these values into Spotipo by logging in the dashboard, and go to Settings-> SMS Gateway.
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Select Twilio as SMS gateway and enter the Sender ID, Account SID and Auth Token and save the configuration.
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Test the configuration by Clicking on Test and enter a phone number to send a test SMS.