XF 2.1 How to customize / add items to right side of header?

[tomdav]

I'm trying to figure out how to add items to the right side of the header. I'm hoping to replicate the behavior of the profile image (including how it moves responsively from the header to the options menu as the page contracts). Any tips on where to make these modifications?
Edit: nvm, found it in template: app_nav.less