I was asked to submit three samples in the area I wanted to work in. Since then, I've been approved in some areas and rejected in others. It all comes down to those samples. Be very careful, because you don't get a redo. There is no other procedure to pass. If your samples are approved, you are in. Sometimes, you hear back in a day, sometimes it might take months if they aren't adding to that subject area.

At the time, had to fill out application and submit writing sample. I had to answer some questions and have my application approved. Now, it's more difficult. You need to have a degree and several years experience to write fairly shallow articles for little money.