Often I get the question “I have 2 pages on Facebook now, one that I have created and one that I did not create. How can I change that?”
What most of the times happened was that at some point you have added your company as work experience in your personal profile on Facebook, without creating an actual business page.
This is when Facebook automatically creates a page. One that has this briefcase (see below) and you can not edit it.
This video explains what is happening and how to correct it including a short screencast.