1. Encrypt Wallet: Smartcash-qt ->Settings -> Encrypt Wallet
Type your passphrase here and please remember it
2. Unlock Wallet
You can unlock in Help ==> Debug Windows==>Console
To do this just type into the box at the bottom:
walletpassphrase "passphrase" 600
You need the quotes if there is a space in your phrase else there is no need for them. The 600 means your wallet is unlocked for 10 minutes (600 seconds).
When you Encrypted wallet. It will ask you to input passphrase when you try to send out smartcash