Where do I register PS3?

When I registered the PS3 code on Sony Entertainment Networks website it made a 2nd services account (on mog station) so I couldn't play with my characters. SE gave me another code and did not tell me where/how to put it in. It doesn't fit is SE's register a code section either it is 3 sections 4 letters/numbers each. So where did you guys register yours?

Are you talking about the registration code that you enter in the redeem codes section in the account management of the playstation XMD?