The e-mail function works fine for me. Is your browser compatible with UA's website?

"The United Airlines web site is best accessed with one of the following web browsers:
Mozilla/Firefox 3.6 or newer
Microsoft Internet Explorer 6.0 or newer
Google Chrome 6 or newer
Safari 5.0 or newer (Macintosh)
Disabling browser functions such as Javascript, cookies or SSL may cause certain functionality to be unavailable."