The process is extremely simple. Below is a step by step guide of how to register as a developer and sign up for the Developer Program.
Here is a direct link to the IOS Developer program: http://developer.apple.com/programs/ios/
iOS Developer Guide
Go to: http://developer.apple.com/programs/ios then click "Enroll Now" on the left side of the screen.
Click "Continue" and sign in with an existing Apple ID, or create a new one.
Select option to create new account under New Apple Developer and on the following screen choose to sign up as an individual.
Complete the personal profile information. When completing the Apple ID personal profile, please remember that you will need to provide these details to our company upon successful sign up. Therefore please do not use a password that you use elsewhere.
In the professional profile choose iOS > Choose your primary market > New > No other platforms then "Continue".