Hi there, I am Cris and will be glad to assist you.
A PDF is a type of file. Adobe Acrobat is a PDF viewer which allows you to open the PDF and it is most likely your default PDF viewer program. Your file should be saved as PDF file when your saving it.
If you like we can do a remote session I can check what your doing and see if you need to correct anything. Also, show you how to use a PDF converter as well.