Hello Byrons,
As per the description above, you want to purchase an additional subscription to Adobe Acrobat Pro DC for two more users, Is that correct?
For pricing, you may refer to Plans and pricing | Adobe Acrobat DC Link: https://acrobat.adobe.com/in/en/acrobat/pricing.html
For more information, you may contact to Adobe Support Team through https://helpx.adobe.com/in/contact.html
I have also shared the direct contact details of Adobe support via Private message, please check your email inbox.
For more information about the activation, you may refer to how many computers can I install acrobat pro (Installation & updates)
You may also refer to Activate and deactivate Adobe products
Hope this helps, and let us know if you need more information or assistance.
Regards,
Anand Sri.