WebSuperGoo.ABCpdf8

I am combing a massive program for work that 4-5 other programmers have worked on before and have ironed out bugs. I ran into an error related to the following line of code at the beginning of the file:

using WebSupergoo.ABCpdf8;

      

        
        
        
      

    

it gives the following error: "The type or namespace name 'WebSupergoo' could not be found (are you missing a using directive or an assembly reference?)"

I know it has to do with a link that I did not include and I found a website that has files for it. But I can't figure out how to bring the link. I created a link using a DLL file and then included the link, but I still get the error. I do not have permission to host the program on the Internet, but I can provide more details if necessary.

Any suggestions would be appreciated. If you need more information, do not hesitate to ask. Thank!