To clear your site's cache, please follow the steps below:
1. Login to the site with the admin account
2. Click on "Configuration" in the administration menu
3. About halfway down that page (in the right-side column), there is a link for "Performance"
4. Click it
5. There will be a button at the top of the page reading "Clear Cache" ... Click it
The cache will flush, which can take anywhere from 30 seconds to 3 minutes. It will give you a message when it has been cleared.
Please note, clearing the cache should be done only when needed. It is not good practice to clear the cache too often. Please do not change any settings on the page.