I have been trying to customize the appearence of my blog for weeks and no matter what I do, any of the changes will take place.
Would you mind giving me a specific example of what you're trying to change, and where in your dashboard you're doing it? I'll be glad to help once I know a bit more.
I have also been trying to ad facebook and twitter buttons on a showcase side bar, and they wont come up.
I'm seeing these widgets in your footer:
If you wanted to display them on the Showcase Sidebar instead, just keep in mind that you'll need to assign the Showcase Template to one of your pages, as explained on the Twenty Eleven information page.
To get started with the custom Showcase Page Template you need to create a page for it. Choose the Showcase Template under page templates in any page, save it, and assign it as the front page in Settings → Reading. This will change your site from the standard Twenty Eleven blog look to Twenty Eleven’s fancy showcase. You still have you regular blog list at hand for several views, like categories, searches, and tags and you can specify another page to work as your blog if you want to.
Just let me know if you need further help.