I need to make a change to the header of a DotNetNuke website I have Admin access but not host access. I can also access the file directory of the website via FTP.
Is it possible for me to make changes to the header of the index page?
If you are talking about making changes within the
<head></head>
section of the document, you can set this up on a page-by-page basis in the page settings. From a global basis there isn't really a way to do it, unless you want to modify default.aspx directly in the core.
It really depends on the changes you wish to make to your header. In any case though, you would need additional functionality added by someone else. For example, if you simply want to inject content into the header, you can use an injection module to inject anything you want into the page header. Or, you can do this through a skin. Unfortunately, like Mitchel said, without some configuration you are limited in available options.
You'll need to determine where the content is coming from. If it's in the skin, then you'll need to edit the skin files via FTP (probably in /Portals/_default/Skins or /Portals/[Portal ID]/Skins).
If it's just a module in a header pane, then you can use your admin access to update the module (unless you need to change something that's not configurable in the module).
来源：https://stackoverflow.com/questions/10336704/change-head-head-in-dotnetnuke-without-host-access