There will be times when you need to upload a file to your server, in other words, "save a file to your website". The easiest way to do this is via an FTP client.

Recommended client

Filezilla - http://filezilla-project.org/download.php?type=client

To connect to your site, refer to your welcome email and it will show the FTP settings. Once Filezilla is installed, you can connect by filling in the following variables at the top of the screen:

Host: yoursite.com
Username: [in email]
PW: [in email]
Port: 21

Click Quick Connect.

The pane on the left is your hard drive, the pane on the right is your website. You can simply drag & drop items from one side to another.

Navigate to the /www or /public_html folder on the right-hand side. This is the area where items are visible to the public, also referred to as the ROOT directory. If you upload a file named file.htm under the /www folder, then you could find it through your browser at http://www.yoursite.com/file.htm