Unable to change title of modal dialog

Hi All,

I have a custom icon on which I am calling upload form of my document library 

<span class="uploadIcon" onclick="javascript:SP.UI.ModalDialog.ShowPopupDialog('https://mysite.sharepoint.com/sites/test/_layouts/15/Upload.aspx?List=%7B159D7C5E-02BF-4F53-8C5F-2514810CEF6F%7D')"></span>

So this opens upload.aspx and I select the file, after which the editform.aspx opens in pop - here I have added my custom js which is changing the look and feel of the form.

The issue is I am unable to hide "x" icon, and also I am unable to change the title of the pop up which is "Add a document"

I am not getting "x" element nor getting any elements from <div class="ms-dlgTitle" style="cursor: move;"> - Not getting the elements in document.ready and this not working even with setTimeout

SP.UI.ModalDialog.showModalDialog(options);  
var options = {  
    title: " Title",  
    width: 400,  
    height: 600,  
    url: "/_layouts/newform.aspx"  
};  
SP.UI.ModalDialog.showModalDialog(options);  

On click of "x" need to call custom function and need to change pop up title.

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Thanks in Advance, Jiniv Thakkar