Each Waze user starts as the initial "Baby" rank. The table shows the various ranks and how you can move up in ranks. This rank is tracked in the Waze client application with the icons you see below.
To reach Royalty rank (or king rank), you have to be in the top % of all Wazers in your locality (in the US, this is determined by state).
The top % is calculated once a month, and if more and more Wazers get points, it's possible that the total amount needed to reach shield / sword / crown will actually go up. While it could be frustrating, it helps us guarantee that no one gets the 'royalty' rank for good - it always gives a chance for new Wazers to come along and get it.