Help altering levelup.php

[xCataluna]

Hello. :3

I've recently been trying to add a line to the page you see when leveling an adoptable... and failing. X3

We have an adoptable with a promocode attached to each level. The rewards system sends it to the pet owner, of course, but we would like to have a link displayed on the levelup page as a thank you to the person clicking.

I need the page to check if the adoptable is type "Happy Birthday".
If yes, I need it to check the current level and retrieve the associated promocode.
And then I need to make it display a little message with the link containing the promocode.

And I can't figure how to do it. >.<
I only know as much php as I've taught myself, and I've no idea how mysql works. I think I may have developed an irrational fear of it. XD

So I come to you, and beg your help and your patience, please. :3