How do I make my blog eligible to AdSense and get monetized?

whichever I try to press the "sign up for AdSense" button.
I found it dimmed and not working.
like in the image below with the message you see beside.
what should I do to be able to make that button work and link my blog to AdSense?
How do I make my blog eligible to AdSense and get monetized?
Answer-
According to Google, it does not approve AdSense accounts from India and China till 6 months to avoid spammers.
How do I make my blog eligible to AdSense and get monetized?
While AdSense is a bit lenient to this policy, the onus of proving that your blog is worth being an AdSense publisher is on you.
Though there is no hard and fast rule about the number of posts you need for AdSense approval. The general consensus is that on an average you need atleast 30 quality posts before AdSense approves your account.
If you write detailed articles of 2000+ words you may get approval with just 20 posts and if you writed 300-500 word articles you may need 40-50 posts. It also depends on amount of contextual backlinks you get.
With everything in mind, it may take anywhere between 1 month to 6 months before you get AdSense approval. Though I know bloggers who could not get AdSense approval even after 6 months.
So forget about AdSense, continue to write quality posts and eventually AdSense will approve your request.
Hope this answers your question.