Log in to your WordPress website.
Click on LiteSpeed Cache in the menu to the right of the page, then click Toolbox.
Click Purge All to only clear data for this website, or click Empty Entire Cache to be 100% certain everything is cleared (typically useful if a site has been re-installed or cloned and the cache may contain tagged for a different install)
To clear the cache for a specific page, you can visit the page while logged in as an administrator. Over the LiteSpeed icon in the top toolbar and click Purge this page.