I can't get the header to work, it just doesn't show up on the page.
Can you explain your problem in more detail, please?
Please always attach a link to your website so we can check it out. If the page is offline(localhost), then our help will be limited. You will have to contact us when the page is online. Also, please make sure that the page is not under maintenance before you provide us with the link.
It is always a good idea to also attach a screenshot showing your issue.