1. Go to http://developer.apple.com/devcenter/ios/ and log in.
2. Under iOS Developer Program in the sidebar, click iOS Provisioning Portal.
3. Click Certificates in the left sidebar.
4. Click the How To tab. The Obtaining your iOS Development Certificate screen displays.
5. Follow the instructions, including those under the Generating a Certificate Signing Request, Submitting a Certificate Signing Request for Approval, Approving Certificate Signing Requests, and Downloading and Installing Development Certificates.