Insert HTML Element
Choose Add Element in the Duda Site Editor and click on Html.
Paste this section of code into the HTML box, and then click on Update.
Edit POWr Mailing List
Select the Settings Icon in the top-right corner when your Mailing List Plugin appears. The POWr Editor will open.
Edit your Plugin using the POWr Editor.
Note, you can launch the POWr Editor from your live website or from your Duda Site Editor.