Here's how you do it:
- Download NinjaExplorer
- In the administration area of your Joomla site, go to Extensions >> Install / Uninstall and upload the file.
- In the administration area of your Joomla site, go to Components >> NinjaXplorer and you will have access to your server directories and files.
This tool can be used to upload files, delete files and edit files (amongst other things) just as you would do with an FTP client.
Be sure you don't delete anything you don't know the purpose of - and this is a good time to remind you to back up your site regularly! (see our newsletter on moving your site from local to live server and use the technique mentioned to back up your site).