When you remove a student from your Subject, their work will disappear from the Markbook. Archive the student instead to keep a record of their work.
Warning: Removing a student will not solve login issues. Make sure the student is using the correct email address, and give them a temporary password.
On the Students page, select the Class that the student is currently in. Find the student's name in the Class list and click the Remove button - the bin icon - which will prompt a warning message. Read the message carefully and then click Remove again to confirm.
If a student has multiple accounts, contact Stile Support to merge the accounts together. This will preserve all work completed on both accounts.