I’m wondering how to do something like that: http://www.youtube.com/watch?v=kfR3u-O4djw (0:23). Could someone give me a tutorial, please? Thank you very much! 
Enka:
I’m unclear what it is in that video you want.
Can you be a little more clear?
If you are asking “How can I put a menu into my game?”
This is is a Graphical User Interface (GUI) issue:
Do you mean “How can I make an editor window with popups?”
This is editor scripting:
I used the “EditorWindow” to make this:
Do you mean “How can I make a custom menu for my scripts?”
This is using the “MenuItem” command:
Sure I right wanted to do something like that! Thank you so much man! I tried the links you wrote in that page, but they didn’t work! Could you give me, please? Thank you very much!
The links in my first post are working. They are click-thru’s. Don’t try to copy/paste them, as they are visually truncated to save space. Which of these three things were you trying to do?
Yes, I’m sorry, I meant the onw in the youtube comment Anyway I’m trying to do exactly what you show in your video!
That is using an editor script.
The editor class
ScriptableWizard
EditorWindow
I used an “EditorWindow” to make that popup. I would start with working thru a quick “ScripableWizard” to do something simple, then look at the “EditorWindow” for more control.
Prime31 seem to have a series of youTube clips on this:
Search for the others in the series.