The Yoyo app is available on iOS and Android. We also have an app for merchants, so make sure you download the relevant one. Yoyo is unfortunately not available for Windows Phones.
To register on Yoyo you need a valid email address - and that's pretty much it.
It's completely up to you whether you use your personal or professional email address. You are also able to sign in with Facebook or NUS Extra, for the students who have an NUS card.
You will then be asked to link a payment card to be able to transact with Yoyo.