How can I send my coins to an exchange?

2

You can ‘withdraw’ them directly to a bitcoin address;

In order to send them from there, Make a wallet on Omniwallet Omniwallet™ - The Next Generation Wallet
and import the private key to the bitcoin address;

Note: You will need about 0.25 USD worth of BTC to send MaidSafeCoins for each transaction from omniwallet.