Screencasting for the fist time

This is the first time I´ve tried to make a screencast.

• First I tried to use screencast-o-matic, but I couldn´t get the audio.
• Then I downloaded Jing and made the recording but the speed got too slow (didn´t like it)
  
  Well, I still haven´t got what I wanted. I wanted to make a screencast with the speed of screencast-o-matic but WITH AUDIO! But it doesn´t work! I´m getting crazy!!!!!
  
• I´ve finally found a solution! I was working with the Firefox browser and the audio didn´t work but with Internet Explorer it did.
  This is the final result: