How to edit the Panel in Ubuntu 14.04

I want to remove the mail icon from the Panel is it possible to do that? I tried to find some solution but all was for the old version of Ubuntu.

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In /etc/xdg/autostart you should see a .desktop file for every indicator, its name will begin with 'indicator'. Here's an example of a bluetooth indicator (indicator-bluetooth.desktop):

[Desktop Entry]
Type=Application
Name=Indicator Bluetooth
Exec=/usr/lib/x86_64-linux-gnu/indicator-bluetooth/indicator-bluetooth-service
NoDisplay=true
StartupNotify=false
Terminal=false
X-Ubuntu-Gettext-Domain=indicator-bluetooth

Open the .desktop file that corresponds to the indicator you want to remove, and find the 'NoDisplay' line and change the value to true (as in my Bluetooth example). If the line does not already exist, you can add it.