[Theme: EvoLve] Add a new button

Hi I have a small problem:

I am using two websites at the moment (english/german language).
What i want to do is, to add a button/image in my header next to the logo for example, where I can implement a link to go to the other website.

Is it possible to add a new image in my header over the navigation bar without editing the php files?

Best regards

remech