Hi Emmaw,
I have checked your account information and found an active subscription of Adobe Acrobat DC under it. So you should be able to access the Edit Tool without asking you to pay again.
I assume that you have been trying to access your subscription through wrong application "Adobe Acrobat Reader DC"? However you should be working on Adobe Acrobat DC.
If you are working on Adobe Reader DC (free application) and trying to use the Edit feature, then it would take you to the "buy now" page. Because Reader DC doesn't support the Edit functionality.
You may download the Acrobat DC to access your subscription- Download Pro or Standard versions of Acrobat DC | Non-subscription
For more convenient you may uninstall the free app Adobe Reader DC- Download Adobe Reader and Acrobat Cleaner Tool - Adobe Labs
Hope this helps.
Regards,
Akanchha