I just downloaded Xcode for C code self-learning, and i have my apple account logged-in to Xcode. What confused me is there seems constrain for editing due to identifiers missing. If I understand correctly, the identifier is just for who has registered for the $99 yearly developer membership. Messages as below: Does it mean I cannot learn and testify objective C through Xcode if I don't pay for it? I am tad confused if I pay for the membership but it takes me years to trial and error to successfully publish the application and I will have to pay for years for the membership, then would be a big amount. It also keeps saying that my account is not on the development team, ^but my every attempt to 'fix issue' leads me to payment of developer membership. If I have mistaken the above idea, how can I use Xcode with full functions? Please forgive my innocence for the structure, I am a total newbie to programming and application. Your advices will be much appreciated!