What does it mean when a member record is locked?

If you receive a message on the screen when you try to edit or add classes to a member record then it is because the person using the login name shown on the message on the date shown. 

If two people try to edit a member record at the same time then the record saved by the second person will be the one which prevails. So if one person is editing members and the other is adding them to classes and the class editor saves their record after adding the person to the class and then the editing person saves the same record which would not have the classes marked on it as it was being edited when they were being added then the classes recorded for that member will be removed. For this reason if a member is being edited and the record is open then no other user can edit that record or add them to to any classes while the record is open.

Should the date and time show that it has been locked for some time then the record can be forcibly be unlocked in Settings/Locked Members. Your system Administrator or someone with access to Settings can do this for you if you do not see this option on your Member Wizard menu.