How you want to cash out if as a btc then you just a btc address of the receiver and if as usd then you just need to exchange your btc first to usd then withdraw them.
If you will explain then we will be able to answer it.
Secondly why dont you sink your book mark with your gmail?
First, what more do you need explained? Like I said when I get to the point where I want to the point where I want to cash in the bitcoins for cash how do I do it? Pretty self explanatory.
Secondly, how do I do that with gmail?
If you want to exchange btc to cash you use localbitcoin.
If you have a gmail acount you can sink your bookmarks. So when you open your gmail any where you can sink there your bookmark