Any available funds in your account may be taken out at any time. To view the available amount in your account and the amount that can be withdrawn, go to My profile and click the Withdraw tab.
All withdrawals are sent to you through PayPal.
If you have used PayPal to deposit money, the PayPal account you used will be where your money is sent.
If you have not made a PayPal deposit, you will be transferred to www.paypal.com, where you can set up a PayPal account or log into an existing PayPal account. All future withdrawals will be made to that Paypal account.
One thing to keep in mind is that there are fees associated with a withdrawal. This means the larger the withdrawal the better for you, this way you do not make several small withdrawals and get charged for each one.