Simplify recorded code

In many posts I have found that solution recommended is to work with small codes. I am a non technical person and hence jumble as to where these codes are to be written. Even if they are just to be copu + paste, where do i take them and how to execute them. E.g in one of the recent post http://excelforum.com/showthread.php?t=499280 for inserting rows, a small code was recommended.

How do i take it further ?

thanks in advance...