To ensure that you installed UTAU correctly, you can check this tutorial.
This tutorial will go over 4 steps to set up UTAU. Changing system locale Checking the decimal separator Installing UTAU Changing UTAU to English Changing system locale In order for UTAU to work correctly, you will need to set your system...
utaforum.net
In order to type Japanese characters on Windows, this is how to set up an extra keyboard. When enabled, you simply type romaji on your keyboard and it'll automatically be converted to hiragana.
Typing in Japanese is essential for using Japanese on a computer. This article shows you how to type in Japanese using the MS-IME.
cotoacademy.com
Also, please note that Kasane Teto's new Edge voicebank is an addon voicebank. To use Teto, you will need the main voicebank first. There are three options for main voicebank that you can download from this page.
kasaneteto.jp
最新版『連続音』+『単独音』ライブラリー: Latest VCV + CV voicebank
最新版『単独音』ライブラリー: Latest CV voicebank (I recommend this for beginners)
『英語音源』ライブラリー: English voicebank