Download the latest version of stacey.
Delete the /content, /public & /templates folders.
If your site already contains content, leave the /content folder as is, and don’t overwrite it. You may have to do a little tweaking to get your content to match up with the new template, but it shouldn't be anything drastic.
The zip file should contain three directories named content, public & templates. Drag them in to replace the ones you just deleted.