You can import your sample into Sawtooth Software.
Your sample would normally include, but is not limited to, an ID or password plus additional sample fields (e.g. age, name, location, gender, etc.).
Click on the Access key and define your ID / password under the Password Fields tab and define any additional sample fields under the Merged Fields tab. Enter all relevant information.
Your sample can be imported via a CSV file format.
To display your ID or password, simply insert this SSI Script onto your survey page ...
[%Password%] if your ID is called "Password".
[%ID%] if your ID is called "ID".
Ensure your ID / password and additional sample fields are defined exactly the same within your CSV file and within the Sawtooth Software authoring. tool.
Every respondent should receive their own unique survey link which includes their own unique ID or password.
Another option is to not import your sample in and pass your sample fields in via the survey link. You would define your sample fields in the Pass-In Fields tab instead. Hit F1 for HELP in Sawtooth and search on one-click access to survey. This will show you how to setup your survey links.