To edit a PDF file, you need Acrobat Pro or Standard. If you'd like to try Acrobat, you can start a free 30-day trial. For more infomration, please see www.adobe.com/products/acrobat.html.
That sounds like the Adobe PDF Pack, which allows you to convert files to and form PDF. If you're wanting to edit files, I would suggest that you convert that subscription to an Acrobat Standard or Pro subscription, which will allow you to do what PDF Pack does, and a whole lot more, including editing those PDFs.
If you'd like, I can help with that. Take a look at the link that I provided above, and let me know if you'd like me to convert your subscription to an Acrobat Standard or Pro subscription.