Instead of SecurityAssist, you should probably use dataassist. Security Assist is mainly about login and if you don't want login, DataAssist is a better solution for database manipulation in general.
You may want to redo your registration page with dataassist, or at least remove the insert record server behavior currently applied and apply the one from dataAssist instead.
This will automatically store the newly inserted record ID into a session variable that you can then use to filter a recordset on your second page that will allow you to display the newly inserted results.