The easiest way I think is by joining in some signature campaign in this site,
You would be pay by posting some constructive post in the threads.
True. You can earn BTC online. But if you are pertaining to earn money, 'online' is broad which means there are lots of ways, signature campaigns, investing, trading and the likes. You can use your skills, especially in language to promote advertisements. Freelancing is also one of the choices, web developing too.