Am I qualified to teach English here?

You are qualified if you meet the following requirements:

1. You are a native English speaker;
2. If you speak fluent English but you are not a native English speaker, you have to state in your blog that English is not your mother tongue. And you need to prove your English is good enough to teach Chinese English learners by correcting their English on this website.
3. If you're from Europe, India, Philippine, Nepal, and your English has very few accent. It's OK. But normally you may want to adjust your hourly charge.
4. If you are a Chinese but very good at English, yes you're qualified to teach English online also. In this case your English does not need to be very good since you can help those students who cannot learn from a foreign teacher.
5. Every teacher has to prove their English by correcting other users' writing. If you cannot find the mistakes on their writing and explain why, then you're not qualified even though you have been speaking English in your whole life.