iOS Install aps on real device(iphone)

[sajjadzare]

for register my app with developer account and install it on real device i do below steps

1.Log in to the iPhone developer center
2.Click on "iPhone provisioning portal"
3.Click on "launch assistant"
4.Follow the steps

but occur below error

Code sign error : the identity 'iphone developer' doesn't match any valid certificate/privarte key pair in the default keychain

after i follow steps in "launch assistant" should i enter any code,... to xcode ?(means enter sth(sign code,...) to build page(info->build) of my app)