However, I've also got a blockchain.info wallet. Would that be easier, perhaps?
If you would prefer to use that wallet:
Click the "Import/Export" link:
Then click on "I Understand":
You can then either type in the private key to import it:
Or if you printed QR codes when you printed the paper wallet, you can scan them:
Note, that once you use a private key in a wallet, you should consider it no longer secure. It would be wise to create a new paper wallet for storage of any funds that you don't spend and send the entire unspent balance to the new paper wallet if you want to keep it for long term storage again.
Thanks a lot!