Awesome, thanks!
What does "Group trustless mixing using coinjoin" mean? And mixing is when you send you transfer together with other transfers so it can be traced less easily, right?
And by "will send from any address you have coins on" you mean from any address that I have imported in my wallet, or from any possible address and I have to put in my private key as well?
There's a thread about coinjoin here (
https://bitcointalk.org/index.php?topic=279249.0) if you want to learn more about it. Mixing is when you send transactions through multiple addresses so your coins can't easily be tracked. If there is enough volume it's more or less impossible to track.
Will send from any address means any address in your wallet. I have multiple addresses with multiple coins in my wallet, blockchain.info will choose one for me using the quick send. You don't need to do anything else for that.