Using the 'F5' key can refresh the browser, but sometimes it refreshes the browser using cached content. This can be frustrating if you're trying to see updates you know exist but aren't showing up.
Try pressing 'Ctrl+F5' to refresh your browser. Using 'Ctrl+F5' will refresh your browser while ignoring all cached content. So hold down the 'Crtl' ket as you tap the 'F5' key.