With ShadowCash there are two units of account. One is SDC (call them ShadowCoins), the other is SDT (Shadow AKA Shadow Tokens). The SDC is transparent and tracked on blockchain the same as Bitcoin. But the SDT uses ring signatures and dual key stealth addresses for anonymity. There are 4 options for sending. You can send SDC>SDC, SDC>Shadow, Shadow>Shadow, or Shadow>SDC. For the latter three it requires a stealth addy. To make a stealth address go to receive tab and click new address, and tick the stealth address box.
To send your Shadows(SDT) to SDC, go to send tab, and choose the Shadow>SDC option. Enter your stealth address and press send. You will then effectively change your Shadows back to SDC once the transaction is confirmed on the network.