Nice to meet you and I'm tryin to get the 15 posts too
I'm just doing it by saying hi to 15 different people
I dont speak for the site in any way but I don't think they really care about the quality of the first 15 posts, they just want to make sure you're a real person and not just some company advertising it's products.
If I'm mistaken, I apologize in advance for not making my first posts longer