please teach me step-by-step to record streaming sound on the computer

you told me enter in this page of the manual: Can Audacity record YouTube, internet radio or other streaming audio?
then i entered Tutorial - Recording audio playing on the computer
Step 1: Set up devices to capture computer playback
then Recording computer playback on Windows
Step 2: Turn Software Playthrough off
use the Recording section of Audacity Preferences:
Preferences: Recording>> a whole form to clic and set in many places
Step 3: risk of clipping
Recording Meter Toolbar
Step 4: Make a test recording
then, Step 5: Make the real recording >>
Step 6: Backup the capture

Step 7: Editing
i opened the link>
and also these other links:

my real problem is how and where do i set up all these things in order to play the streaming sound
on the computer and push the Recording Red Button to record it and
have an audio file to put in my hard disk

so simple like that, please teach how do i put this to work!!

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Please see this tutorial in the Audacity Manual: file:///C:/Program%20Files%20(x86)/Audacity%203.0.0%20RC06/help/manual/man/tutorial_recording_audio_playing_on_the_computer.html