Once I've linked plugin, how can I #include the headers

I just followed this tutorial here. My project appears to build correctly while the third party plugin is referenced - or at least I think. How can I test it now. I’m new to using .lib. I know that I moved the header files over into ThirdParty/Plugin/Includes/ . So now, do I still need to include the header in the includes folder? If so how do I write that out

#include “ThirdParty/Plugin/Includes/ExampleHeader.H” ?

I can’t seem to reference the header inside the ThirdParty folder, perhaps because I’m not writing the address correctly.

…/…/ThirdParty/etc… worked for me.