Changing the user password is done by selecting that user's Change Password sheet.
The write the new password twice and push 'Save' -button.
Deleting Users
Deleting user can be done fron the trash icon on right side of the user name.

Notice that only Account Admin user level can delete other users.
After pushing the delete button, the system asks if the "videos are transferred " to some other users, so that he/she can continue being the administrator of the videos.
Select the user and then push "Delete user".