Once the TXTinIT App has been installed into your Salesforce Org, you will need to authenticate the app with both TXTinIT and your SMS Gateway Provider. This will enable you to send text messages directly out of Salesforce.
This guide assumes that you have chosen Bulletin as your SMS Gateway Provider of choice.
Authenticate Your Org
Step 4: Enter SMS Gateway Provider Credentials
Select Bulletin. If you are using another Provider then select the one relevant to you.
Key in both your SMS Gateway Provider User Name and Password.
Click Save and Continue.
This step is required to enable Salesforce integration with your chosen SMS Gateway Provider