You can download OpenUTAU
here
and the voicebank
there.
Download the one labeled "English".
Install OpenUTAU like any other regular program.
When installed, go to "Tools" and then "Install Singers...", and select your downloaded voicebank .zip file.

Install it, then select it from the track menu.
You also need to select the correct phonemizer; I chose "EN X-SAMPA".

Congratulation!!! You can now make noises with Teto!!!