How can I active Web Deploy feature on my site and where is the Web Deploy login info

Control Panel V3 > Hostings > Websites
1. Login to your hosting control panel --> My Websites, then click on the target website
 
2. You will find "Show Web Deploy Info" from the page, click it and then turn it on
 
3. You will be able to find the corresponding web deploy login info from there when it's turned on.