How can I send Shared Coins using BlockChain new wallet?!
I can't find that option in the new wallet!
You cannot. That feature has been was "temporarily" cancelled due to numerous reports of stuck transactions and growing awareness of its privacy limitations:
https://blog.blockchain.com/2014/03/17/shared-coin-suspended-temporarily/
http://www.coindesk.com/blockchains-sharedcoin-users-can-identified-says-security-expert/
I dont think the previous version of SharedCoin is ever coming back because its GitHub page is now gone: