How do you apply the code for widgets and Home Page ???

[fraforest]

Hi Brian :
In the post "How to customize the side bars V 3.0 you say ......
You will need to go into your WordPress dashboard and go to Appearance > Widgets and apply the following code to each corresponding widget block.....
I don't know how to access the place where to put the code !!!
I understand that with a right click I can see the code of the page but I can't change it .

I have the same problem with the Home page.
Apparently it is not listed on the dashboard and how to access the code (I guess it is in the home.php template but there is no customization in it at all. If right click on the home page, all the code is there but how to be able to change it ?
Thank you.
Francois