Handling Erroneous or Mistyped Users in Your Console
This can potentially result in users mistyping or misformatting their email addresses, creating duplicate user accounts in your user list.
To prevent users from using any account other than the imported account they were added with originally, admins can turn off the “Allow Users to Signup” option.
To do so, simply log in with your admin account, click your email address in the upper right-hand corner and select “Account” in the drop-down box.
Next, un-check the box “Allow Users to Signup”. This will prevent users from signing up with email addresses that have not already been imported into your Users area.
Un-check this box:
NOTE: As of September 2016, new KnowBe4 accounts will have this "Allow Users to Signup" feature turned off by default. You can re-enable it if you'd like to allow users to sign up for their own accounts.