Hi @daltonNYAW9. The specification for that tab and all the global forms found on that tab are stored in an external XML file, usually named "iLogicBrowserUiFormSpecification.xml", and usually found under the ...\Design Data\iLogic\UI\ folder. The contents of that file are in XML code, not HTML. Both coding types are similar in some ways, but are pretty different in other ways. XML is primarily for storing organized Data, while HTML is primarily for web page design. You may not be able to accomplish what you want even if you learned XML coding through.
Have you tried editing that tab manually yet. That tab (like the regular Forms tab) is sort of like an iLogic Form of its own. If you have the Global Forms tab active, right-click your mouse over an empty portion of the panel below that tab, then you will be presented with a short right-click menu with the options: Add Form, Edit, Paste Form, Open Containing Folder, and Refresh. If you choose the Edit option, the iLogic Form editor dialog will open, but you will be editing the contents of that tab itself, as if it were a Form. It does not offer all the same options as if you were editing a regular iLogic Form though, because it contains the 'Form' option, and does not contain the 'Picture', 'Picture Folder', and 'Label' options when editing the tab itself. This leads me to believe that adding a picture by code to the XML file may either not be possible either, or attempting to do so may have unpredictable consequences.
Wesley Crihfield

(Not an Autodesk Employee)