Let me branch this off into a new discussion since we might be mixing apples with oranges.
Welcome to SCN.
By 'overview' do you mean the overview page, like thisSCN Support? What you should do is reach out to the content strategist listed for the space. They're all listed in the SCN Space Contact List and are SAP employees (so you can find them in the company eMail directory). They'll make sure you're setup with your permissions and provide information on editing space overview pages. You can also reach out to me offline.
Thanks,
Jason