Had Adobe Annual Pack --now Adobe Standard-cannot edit

I accidentally purchased the Adobe Pack thinking I would have the regular features of Standard.   Returned that and ordered and installed the Adobe Acrobat Standard DC but I still cannot edit or make format changes and comments on any PDFs.  Everything is ghosted out when I click the 'Edit' button.   I had Reader installed and ended up uninstalling just in case that was the issue.   Also selected Standard as my 'default' in preferences....still no luck.  How do I get the features of Standard to work...this has been 4 days of continuous frustration.  I just want to insert pages and make notes on a PDF.   Any help appreciated...