You have to play ranked rounds in order to imporve your ranking. I have noticed you have a big "Zero" ranked rounds.
Try this:
Click "Play Now"
Then from the main menu, select "Single Player Game", then click "Select Course" and choose either Bethpage Black, Kiawah Island, or St. Andrews.
Then under "Game Type", select "Stroke Play" select "Ranked" and the holes you wish to play.
Have fun!
Krokk