It's simple to change your current hyperlink to the one that will level up your license. Simply add "levelup.php?id=#" and substitute "#" with your License ID number.
For example, if your license id number is 0, then the address you link to should be "http://www.n-masters.com/mariokartlicense/levelup.php?id=0".
We do appreciate and thank people who have registered before we got the level system up and running. ^_^ That's why we will provide a 5 level boost to the first 100 people that registered (excluding Shiiku and me, Link-NM). Registered after that? You get a 3 level boost if your card id is less than 203. Everyone after that gets a 1 level boost.
To not make it harsh but also avoid abuse, you'll need to wait an hour before being able to level up a specific license again.
Some sort of top 10 cards or something around that will be available sometime soon.
Be assured that the license did level up, it's just a cache issue. Also, this issue should only be present if you were using the old license URL. We're testing a fix atm that seems to be working well so far. Simply change the path to your license. Instead of using "http://www.n-masters.com/mariokartlicense/cards/#.png" where "#" is your license id, use the following URL now: "http://www.n-masters.com/mariokartlicense/loadcard.php?id=#" .