First unlock your wallet. Go to your user icon and enter your password.
Once unlocked, click on the 'Send/Receive' tab and select 'Send'.
In the 'Pay To:' field enter either the recipients Syscoin address or their alias. Then enter the amount of coins you want to send.
When all the fields are complete the send button will become active and you can click to send.
You will get a notification that your transaction is sending and a green tick mark will indicate a completed transaction.
You can go to the 'Send/Receive' tab and select 'Transaction List' to see all your sent transactions.