add iphone to icloud account?

Absolutely. On your new device go to Settings > [your name] > iCloud, enter your Apple ID and password, then turn on the features you want to use.

Sign in with your Apple ID - Apple Support

https://support.apple.com/kb/PH2609?locale=en_US&viewlocale=en_US

You can manage your devices linked to the iCloud account following the instructions here: Check your Apple ID device list to see where you're signed in - Apple Support

Patricia

It will not let me add an iCloud account to my iPhone. Says invalid email when I’ve added the email to the actual email app