Add Administrator sub-account: Go to Members > Click Invite members > Enter the email which belongs to the person you want to invite. Then the Invited people will receive a email to verify his email.
Remove the administrator account: Go to Members > Check the administrator' account > Click the bottom under the column of Operation to delete it.
Remove the members to Group: Click Members > Choose the member > Choose the group(If you don't have a group, you can click create group to create it),then this member will be able to manage the devices within this group.
1. The invite email address cannot be an account of a registered business' main administrator account or a management sub-account of other enterprises.
2. The sub-account which be removed will lose the related authority immediately.