Sharepoint designer cannot create workflows: "access denied"

Condition:
You're a site owner and you want to create a workflow in your site, but get error:Access denied.

Solution:
Make sure you have site collection administrator permission or contact your site collection administration.

1. Open your site by SharePoint Designer.
2. Right click Workflow node in Folder list and select "Properties."
   
   


3. Select "Manage permission using the browser" in security tab.