In core/local.config.php a little under the database info. Look for.
Config::Set('PILOTID_LENGTH', 4); // The length of PID, including 0's
Change the 4 to 3.
The first will change when you change profile picture. The rest are font awesome 4x font icons.
You can edit them in the skins folder skyBlue/sub_menu_out.php and sub_menu.php
You can get other icons here - https://fontawesome.com/v4.7.0/icons/
sub_menu_out.php - For Logged out
sub_menut.php - For Logged in
You have no flights with with a landing rate. You can edit the table in the database and add a landing rate (-xxx) or fly a flight with a ACARS to produce a landing rate.