First go to the homepage and find the file that you would like, from your computer by clicking "Browse..."
After you are happy with this, click "Send file" and wait a moment (depending how large your file is)
You will be given a download ID, for your file.. make sure you write it down!
Grab your mobile phone, connect to the internet and direct it to http://wap.file2phone.co.uk
Enter the unique ID that you wrote down, and wait for the download to complete!