Hi, I am new here. I am learning to create a questionnaire with Lime Survey. 
After I activated the questionnaire, I click "Survey URL", the screen shows "To participate in this restricted survey, you need a valid token". 

My questions are:
1. Did I set the survey wih a password (valid token)? 
2. Where can i get this valid token?
3. How can I set the survey without a token?

Thank you. 

Delete the survey participants table - manual.limesurvey.org/Survey_participants#Delete_table

Thank you.