How to send Sumokoin from a wallet I create in wallet.sumokoin.com ?
You'd have to download an actual wallet (see sumokoin.com for official/direct links - do not click on links by 3rd parties). Once you have it installed, you can enter your mnemonic to restore (recreate) your paper wallet.
...and since that means that the newly restored wallet would then be exposed "online" because the official wallet is incapable of cold wallet/offline signing features, I'd take necessary precautions to minimize vulnerability of your "online" wallet.