Move elements in top bar of popup

[Wasserwiki]

Hi all,

Maybe someone could point me in the right direction here. I am new to the Arc GIS WebApp developement and Arc GIS API. I tried to customize the popups of my webapp, but I can't find the related files for the elements in the top bar of the popups. Where can I find these/how can I edit these symbols? I'd like to move them to the right.