Thanks for your support question.
You can then assign your code block to the page or post that you need to, and so long as the output location hook is set to Header and not Footer, that is where it will be.
If you want finer control of code placement, consider using CJT Shortcodes instead of say assigning your code block to a page or post in the Assignment Panel. The shortcode embedder button is situated in your page/post editor toolbar.
Maybe send your website admin (or temp admin) login credentials, and provide more detail on what it is you are trying to do.