how can i take off two step authentication on the iphone? i know it make it less secure but it's also preventing me from logging in on my other device. it asks me the the authentication code but it doesn't give me the option to type it in, which is why i want to remove it. i've tried going into the security setting on my iphone and doesn't give me the option to change it and the apple id website will only allow me to change my password but won't let me do anything else.