Accessing a previous wallet A couple of years ago I purchase a little Bitcoin. I don't know where I purchased it through, but I do have the Wallet Name, Wallet Address, and Wallet Key. How do I retrieve it? Can I access it through any exchange? I'm confused here a little.
Not sure what you mean with Wallet Key but if you mean the password for access to your wallet in the exchange then this will only work in that exchange.

Please search for your address here to verify that your coins haven't been transfered somewhere else.

In case you were provided with a seed then you can use this seed in a wallet like Electrum or Mycelium (an Android app) to recover your funds :)

If you don't have the seed then you better remember where you purchased your bitcoins! :/ Maybe checking your search history or your inbox?