What you require to do:
You will require to register with online Survey sites. When you will register you will be asked a couple of questions. These will be inquiring about your interests, what industries interest you, what products you normally use and so on. Based on what you answer you will receive the Surveys accordingly. Many people opt for more interests and industries thinking that they will receive more Surveys and hence will earn more. Avoid this temptation and trap. The reason being is that usually people / technology which analyze the results have a way to detect incorrect, incoherent answers. These are removed. If the customer / website detects this they may ban you.
Filling Surveys may sound easy and no doubt it is easy. Having said this, do not take it lightly. You need to understand that the company that you are doing the Survey for will be dependent on you. You will be contributing towards their marketing and product development and so on.
Handle answering the Survey with care.