Hello,
I have made my site and it looks great.
One small question though..
How do you edit the content in the sidebar?
That depends on how your site is set up, how you set up your template and how you handled your sidebars. Did you use chunks? If yes, then you would edit those chunks? Is it all set up in the main template? Then you would edit your main template.
A little more information about how you set things up would be useful in answering your question.