Depending on your browser type use the following:

Internet Explorer 5+ or AOL browser 9+ for PC
Hold down the ALT key and select the number/letter of the access key, then press ENTER.

Internet Explorer 4 for PC
Hold down the ALT key and select the number/letter of the access key.

Netscape 6+ for PC
Hold down the ALT key and select the number/letter of the access key.

Mozilla for PC Hold down the ALT key and select the number/letter of the access key.

Safari 1.3.2+ or Netscape 7.2+ or Mozilla 1.5+ for Mac
Hold down the CTRL key and select the number/letter of the access key.

Internet Explorer for Mac
Hold down the CTRL key and select the number/letter of the access key.