In most cases forms are only editable by the user who has (a) created the form, and (b) have checked the box "Save as Draft". In such cases you may see this icon:
Once a form is saved as completed it is then effectively sealed and can no longer be edited for reasons of good data governance.
Forms which are ticketable (i.e. can be completed by an external assessor via a ticket request) will not have a Save as Draft option.
Important: If you try to open a form via My Filled Forms you will not be able to edit it.
To access a form for editing you must do so by selecting the trainee, then the form from the appropriate listing page.