even after 45 posts i have only managed to earn 0.22$

If you've just checked your earnings you will see that you get paid for the previous days postings, make sure they are quality, informative and interesting posts to gain the best benefit, I was paid 7 cents for one post a few days ago. Also, you will find that you will be paid more if you post relevant photos and I believe placing tags with topics. I'm averaging 2.5 cents per post at the moment.