Only follow the steps and you will be fine.
Importing to Bitcore wallet
Right now importing a private key for Bitcore is only possible with the Bitcore Core wallet (download here).
Make sure it is past mid November. It will take up to several days for the Bitcore blockchain to be filled with all the transactions.
Start Bitcore QT. As soon as your wallet has been synced go to Help->Debug Window
If your wallet is encrypted it must be unlocked first. Enter "walletpassphrase [yourpassphrase] 600" (without the "" and without [ ])
Now you are ready to import your private key. Enter "importprivkey [yourbitcoinprivkey]" (without the "" and without [ ]). Make sure there are no spaces in your private key.
Done! Your wallet should now contain 1/2 the amount of Bitcore you had in Bitcoin!