IDE 1.6.4

good day,
I have installed the ide version 1.6.4 on my win_7 64 bit PC.
How to use Boards Manager tab in order for me to handle the ESP8266 please ?
Any help will be appreciated.
Thanks in advance

Try this link:

Thanks a lot, it works now.
I am going to load an example but I do not succeed.
What firmware should be flahed on the esp8266 please ?