How to create button in pure JavaScript?

[web_editor]

Hi, how to create button in pure JavaScript? I’m not really a programmer. Please help me. Thanks

Here’s the html tag, that I want the button to be appear/display

<div class="activityHeaderPanel">

Note: I don’t have an access to edit an entire html file.

[web_editor]

How can I add that in the code below? If the user click the button, there’s a confirmation box, ask a question and when the user click ok, there will be a popWindow open

if (confirm("Does the client has new address?") == true) {
                    popupWindow = window.open('/NewAddress.htm', "NewAddress", windowFeatures);
                    popupWindow.focus();
                } else {
                    newAddress = "";
                }

[Author]

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