How can I unlock a questionair for my computer science principle class

Hi there is a welcome student questionaire that is locked, how can I lock it for my students?

If you are talking about the pre-survey, you can unhide it and unlock it in the Lock settings.

yes, I make it visible. but the survey is still locked. there is the lock icon. Students could not do the survey.

You have to click on lock settings and click on allow editing. This will set the editable button next to each student to Editable instead of Locked.

Hi I think I find the problem of my class. There are no students under the editable button.
Should I register students manually? I ask my class to sign in the throught their google classroom. However I do not have them on code. org still.