STEP 1 - Download The DNotes Wallet (DNotes-QT.exe)
STEP 2 - Open The DNotes Wallet (DNotes-QT.exe)
STEP 3 - When The Wallet Is Fully Synchronized, Open "Debug Window"
STEP 4 - Go To Console & Type "importprivkey" Followed By One Space And The Private Key, Then Hit Enter
Congratulations, Your DNotes Are Now In Your Wallet
*DNotes was used as an example, but this method is fairly universal for any cryptocurrency
**Anyone with access to a private key can spend the associated funds. If you are importing a private key that someone else may have had access to, you should immediately move the funds to a new address.