Having trouble with BitMinter and how to send the bitcoins to a site for USD

I haven't got a mining setup yet but with only a like 6 khps without it, I've done a tiny amount of mining just to have a tiny amount of bitcoin so I can try to get things set up from BitMinter to a site that will give me USD.

The only problem is, I can't figure out how to get the bitcoins I have on my account on BitMinter to something like BTC-E or Campbx or any other popular site people use. I don't see an easy way to send like, my login OpenUrlId from BitMinter to one of these sites or send these codes from the site I want transfer the bitcoins to sell to BitMinter.

I mean, if these codes really have to be put in this Wallet.dat file, I can't find it on my windows 7 pc. I read it's in appdata and then something of bitcoin/Bitminter but I can't even find the Appdata folder. Is a generated code from these sites like BTC-E/Campbx or even coinbase just too risky to make these codes inputable through the sites rather than through this wallet.dat?

If I have to put these codes into the wallet.dat of BitMinter, well I just can't find the dang file anywhere. I need a more specific route that I could find it at. Please and thank you.