The process to send funds or making any payment from the wallet is similar to that of the withdrawal function. You can find "Send coins" button in the "YOUR WALLET" section of your account. Enter the Bitcoin-address you want to send your coins and amount in BTC or either USD. You can also attach a short description that will be visible in your wallet transactions list.
The key thing to note is that we will be sending you a verification email to ensure that the coin withdrawal is truly made by you. You will receive a verification code by email which will have to be entered on request.
Once this is verified, your transaction is sent instantly and you can verify the same by using the transaction id on a platform like blockchain.info.
There is zero limits associated with how much you are allowed to withdraw at any point of time, provided it is not locked up with a goal of yours. Keep in mind that a timely withdrawal of funds that are not locked up in investments help you increase the amount of money you can hold invested.