Please help me with learning how to use Toon Boom Studio 4.5 and obtaining the activation code to register it

Hi, I know this feels late, but I’m trying to re-connect with my favorite software, Toon Boom Studio 4.5, you see after I bought it, I didn’t make the time to properly use it. Also, I recently found out that to register my product, I need an activation code, which I probably didn’t get since I didn’t buy it online (one of my aunts bought it for me). Was it supposed to be in the receipt for the software that I obtained?
Now I know that I can still find YouTube tutorials on using my software, but I need help in refining my skills for the software that I have, especially with the Bamboo tablet for graphical design. So, I would really appreciate it if anyone answers my questions with thorough answers that I can understand.
Thank you for reading this post and spread it throughout the community.

Contact Support. They are the people that have to straighten this out with you.