John,
what kind of code do you need to add? if it is JavaScript, you should register your script file and use DNN resource management to handle it.
You might add it to meta text box in page settings or use SQL to add it to this field for all pages

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Cheers from Germany,
Sebastian Leupold

   

Speed up your DNN Websites with TurboDNN

I would consider modifying the skin file which you will likely find somewhere under portals/0/skins/YourSkinName/ or possibly portals/_default/skins/YourSkinName/. Within that directory you should be able to find the view page/control containing your html that will need mods.

These 2 lines might help as an example.. They would be somewhere near the top of your skin's view page/control with the js file located within the skin directory.

<%@ Register TagPrefix="dnn" Namespace="DotNetNuke.Web.Client.ClientResourceManagement" Assembly="DotNetNuke.Web.Client" %>

<dnn:dnnjsinclude id="bootstrapJS" runat="server" filepath="js/bootstrap.min.js" pathnamealias="SkinPath" priority="10">