The Yoyo app is available on IOS and Android. We 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.
You can use your professional or personal email address, it is up to you. 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.