Sidebar.php doesn’t show changes

In trying to add RSS buttons to my sidebar.php, I downloaded a Sidebar Widgets Plugin from AUTOMATTIC, INC. which I thought I needed. They had me update my default theme. I use Kubrick. The widgets weren’t giving me what I wanted, so I took them out of the sidebar and turned off the plug-ins. Now, my sidebar looks different since I’ve updated the default theme. I’m now trying to add the code in Sidebar.php from “toprankblog’s” RSS button maker. But nothing changes in my sidebar. Do I even need to show all those different RSS feed buttons, or does the rpc.pingomatic.com do it all for me? HELP!