There doesn't seem to be a critical issue as you're putting it.Don't fret.You might have added that it as a watch only wallet that's why they ask the private key so you can send (it's a rough guess)
Read through the blog post here,that would help fixing your problem
https://blog.blockchain.com/2014/06/18/tutorial-the-import-export-feature-in-your-blockchain-wallet/
They've detailed it as much as possible.