Dump your Private Key from the Desktop Wallet
To copy the same wallet address click on Transactions on left Bar and right click on the Wallet Address and choose Copy from the menu
Access the console tab
Click on the “Windows” menu, then click Console
To Dump your Private Key type:
dumpprivkey <HTML Wallet Address>
When you Hit Enter it will generate private key for your wallet address
Congratulations! You are now a private key dumper!