You know how you can open an app on your phone to read your email, or pull up a program on your computer to look at your documents? FTP programs are a lot like that, but they provide you with access to the files for your website and/or blog. Many are available for free, like Cyberduck and FileZilla:
http://cyberduck.ch/https://filezilla-project.org/You might also be able to sign in and access your hosting space on your provider's website, too.