To add a new player or to update one go to the profile page of the player, press CTRL + U.
On the new window press CTRL + A (mark everything) followed by the copy shortcut CTRL + C.
Paste everything with CTRL + V in the below source code textbox.

If the player is not updated go to the player profile and press after CTRL + U the shortcut CTRL + F5 to update the source code.