Can't find 'keys' associated with certificates to create p.12 certificates

Hi there, Hope you can help. Wanting to create p.12 Developer & Distribution Certificates - We are going to build our first DPS app using Adobe DPS.

Have gone through procedure to point of double clicking 'ios_development.cer' and 'ios_distribution.cer' to install into Keychain Access.
I can see that these certificates are there in Keychain Access under System 'Certificates'.
However in System 'Keys' the relevant keys are not there. And in Login 'Keys' there are 4 keys that might be the correct ones: 2 public keys, 2 private keys. BUT they do not have an arrow on the left so I cannot see if the correct certificate is associated with them (as it described in the Adobe step by step guide to DPS pg19).
Mac currently on 10.6.8, so I have not yet downloaded X Code. Planning to upgrade system shortly. When I upgrade & install X Code, will I then be able to see correct keys & see the associated certificates together in 'Keys'? Is there anything I have missed? Hope you can help, thank you.