How to use Advanced REST Client to send push notification in Adroid device

Hi, 

I would like to know how to use Advance REST Client to send push notifications to an Android client.
I have a php script that records the email and token of every user who installs my application in a MySQL database and I would like to use these tokens to send push notifications to users. I saw in a tutorial that I can use Advanced REST Client to allow me to do it but I can not. Help me please!

Edit: I installed the 10.0.12-stable version