this forum.... no one told me you can get one for free.... 
where is this written and where do you request for that?
where is this written and where do you request for that?K-Pop Source — Keeping the K-Pop Forum Spirit Alive
ani07
Myth
It's on section 6 of the guide
kpopsource.com
A. New User with an account up to 1 month old:
you may request a Booster Pack of 15 common cards.
To earn your Booster Pack you must;
1. Make an Intro Thread
2. Make an appreciation thread for your favourite artist or idol
3. Make one thread within the Korea, Japan or China section
4. Make one random thread anywhere* on the forum
5. or, instead of steps 3 + 4, you can post a Card Challenge thread (if a card challenge is currently available).
Along with the steps above, you also need 15 comments/posts.
*does not include the gaming section.
B. User with an account 1 month+:
You can also request a booster pack, but only if you have no more than 20 cards (and haven't at some point given your cards away for free).
Your booster pack will cost you 50 points per card, up to a maximum of 15 common cards (750 points for the full pack).
Request your Booster Pack HERE
Since you qualify for B. you'd make a post in the request thread. Just specify you are getting a booster pack I think.
But your account is not that much older than a month, so maybe they can make an exception for you and you can do A instead since it's free. I'd ask if they would allow it.
A Complete Guide to the Trading Card Game - K-Pop Source — Keeping the K-Pop Forum Spirit Alive
Banner by @Yili What is the trading card game? We are excited to announce the Kpopsource Trading Card Game! By completing certain activities you will be able to earn cards of different Korean Idols/Artists, International Artists and other decks such as Anime/Video Games. Once you receive the...
kpopsource.com
A. New User with an account up to 1 month old:
you may request a Booster Pack of 15 common cards.
To earn your Booster Pack you must;
1. Make an Intro Thread
2. Make an appreciation thread for your favourite artist or idol
3. Make one thread within the Korea, Japan or China section
4. Make one random thread anywhere* on the forum
5. or, instead of steps 3 + 4, you can post a Card Challenge thread (if a card challenge is currently available).
Along with the steps above, you also need 15 comments/posts.
*does not include the gaming section.
B. User with an account 1 month+:
You can also request a booster pack, but only if you have no more than 20 cards (and haven't at some point given your cards away for free).
Your booster pack will cost you 50 points per card, up to a maximum of 15 common cards (750 points for the full pack).
Request your Booster Pack HERE
Since you qualify for B. you'd make a post in the request thread. Just specify you are getting a booster pack I think.
But your account is not that much older than a month, so maybe they can make an exception for you and you can do A instead since it's free. I'd ask if they would allow it.