Re: Private key?

I bought bitcoins via post money orders, I gave money in cash with my itcoins address and I received the money on my wallet

How you have generated that bitcoin address? I mean have you generated using some services like bitaddress.org and than you have imported that to blockchain.info wallet? If so than i think you have actually scanned bitcoin address while importing so it remain as watch only address, you should have scanned private key when importing before. Hope you have printed out bitcoin address detail.... If not i think your bitcoin will stuck in that address and you will not have access to it.

I generated this itcoins address by creating an account on blockchain.info

then go to blockchain.info and sign in with the credential it gave you (the wallet ID and your password and if you set it your 2FA) and then you have access tho your funds and private keys there not any other place.