Where to find metaquotes ID in iPhone for push notifications?

Does anyone know how to find the ID for this? I'm using the iphone and there's no settings>messages option for me to find it...

I believe it is set up when you download the app onto the phone, and chose the account. the desktop version of metatrader will first have to be set up for notification. I use an Android phone, so not sure if this is any help. Also, I am not a tech expert, simply a user