A problem to sign up New students

Hello! It became complicated to sign a New student by creating an account for them. No option to put assign a student to the workbook. You have to assign it after from a folder 'without a Workbook' 

Also after all difficulties, I was trying to do so, but it seems the platform 'think too long '

Is it possible to give a choice to the teachers which liveworksheets.com to use? 

The main benefit I found on a New one is subsciption plans. 

Thank you.