Page rank

I got involved in a review group-- and a lot of the reviews say you need a Page rank of 3 or higher...

What is the scale--- mine says n/a for page rank, how can I get this to change?

Alexa Traffic Rank: 4,446,949
Traffic Rank in US: 528,751
Sites Linking In: 3

I currently do not have any reviews, so if you would like to give me a review I would appreciate it :-)