You can earn Bitcoins by the following ways:
1. You can earn in this forum by enrolling in a signature campign and posting in this forum but this way Is only profitable for high rank members.
2. You can also earn here by offering some services like data entry, web development or any other skills you own in the services section.
3. You can earn Bitcoins by trading altcoins and if you want to earn from this way you can go to http://yobit.net website.
4. You can earn Bitcoins by Promoting Faucets and other sites to earn where you get referrals and when they claim you get referral commissions......