How can I select a password for a website with my keyboard? I store passwords for websites in my safari keychain and when I visit a website there is the key icon in the username field.  I can click on this key and autofill the username and password, but I hate touching my mouse.  Can I use a keyboard shortcut to click on that key icon?
You should be able to have Safari AutoFill the credentials when you tick the AutoFill user names and passwords checkbox in the Preferences sheet below: