From Crevado Admin click Customize:
Scroll down to the Portfolio Header and click it:
Enter in the new title/name and click Save.
A pop-up at the top of the screen will confirm that your change has been successful.
Note: If you are using an image based logo then this will be displayed instead of the title. The title will still be incorporated in to the page title for your portfolio and as a result will be visible as the title on search engine results, even if you're using a logo.