register at here https://mlogin.yahoo.com/w/login/miniregister? after sign up fill the corfirmation code with the code that yahoo send to your number,After that sign in to yahoo from ur pc Then chose data account -> set up yahoo email -> chose the id u want then click upgrade my acount, ok yur done but u have to wait until a couple hours until yahoo activated ur number, but dont worry while u are waiting yahoo give u an exploit number id like google exploit in the id that u creat good luck