I just pay my subscription to PDF pack services and can not use send and track.

Hi Adolfoo,

As per your account information I see that you are a subscriber of Adobe Send & Track Annual. Could you please confirm how you have been using the service or what is the workflow that you follow?

As its an online service that you can use via- https://cloud.acrobat.com/send

And also through the desktop application Adobe Reader DC- Adobe Acrobat Reader DC Install for all versions 

In order to activate the service you need to "Sign In" using the correct email address (Adobe ID) and password under which you have purchased your subscription.

Let us know if it still doesn't work.

Regards,

Akanchha