Why can't I edit a single (non staged) brief?

There are several reasons why you may not be able to edit a single brief/form. Below are the common reasons why you may be unable to edit.

1. You are not the brief/form creator
2. You are not named/listed on the brief/form
3. You may be named/listed, however you may not have permission to edit
4. The brief/form is pending approval
5. The brief/form is completed

Please see How do I edit a single (non staged) brief/form? for more information.