You will see a popup window giving you 3 options on how to deposit
Pay with altcoins
Scan the barcode with your ethereum wallet
or copy and paste the address
and confirm your choice
You'll get a notification of your deposit
Making a Withdraw
You will see a popup window giving you the option to withdraw
Go to your wallet
Copy your withdrawal address
Paste it into the into the address field and enter the amount you want to withdraw
Fill out the captcha and select "withdraw"
Double check and make sure you used the right address and select "ok"
You have successfully withdrawn your balance
Select "check the transaction" which will take you to etherscan showing your confirmation status
-edit by tomownzu Reason: lock/sticky/tag topic.