Then the article is incorrect. There is a 3-way tension adjustment barrel on the crank side of the pedal between the spindle and the retention spring. It is adjusted using either a small (2.5 or 3mm, I think) allen wrench.

When RXS cleats are brand new they're a bit of a trick clicking in, and then it starts over again when they start to wear out. Be sure, though, that the toe lug is solidly engaged before forcing anything. The toe section of the pedal can break off.

On the plus side you get low weight, low stack height, durable cleats, and a very pleasantly elastic float function.