Xcode cannot add static library

I created a large structure, which I intend to use in several applications that I will create, however I cannot understand how to create and import a static library. I am following this tutorial as it seems to be the most up-to-date I can find

http://www.icodeblog.com/2011/04/07/creating-static-libraries-for-ios/

The tutorial talks about creating a static library and copying the .a file to a folder along with the .h files;

Now, just drag this folder into the project and Xcode will set up 
all of the linking automagically.

However, when I copy this folder to xCode, the folder is blue and I cannot import any of the files

Then i tried this tutorial

http://www.blog.montgomerie.net/easy-xcode-static-library-subprojects-and-submodules

I managed to get it to import a sample project like this

   #import  <SampleSubproject/SampleSubproject.h>

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