Name
Give the proxy a descriptive name. It can even be the same as the value in the Proxy Server field. However, QS allows only one proxy protocol--either SMTP or HTTP, but not both, per profile. If you have a single proxy the supports both SMTP and HTTP, you need to create a separate proxy profile for each. In this case it's the Name field that differentiates the two. For example. Suppose you have TOR socks proxy on your computer. If can handle both protocols. You could name one TORhttp and the other TORsmtp.
SMTP or HTTP
Select whether the proxy is for SMTP or HTTP connections.
Proxy Server
This is the actual address/name of the proxy server. It could be an actual IP address or a server name.
Port
All proxies listen on specific ports. Indicate the port your proxy listens on here.
Socks
Is this a Socks proxy? If it's for SMTP it MUST be a socks proxy. If HTTP it could be either a socks proxy or HTTP proxy. If HTTP proxy, Socks should be set to no. If it's a Socks proxy, but not TOR, this is likely set to 4.
TOR
Is your proxy TOR? TOR provides anonymous Socks proxy service. If this is TOR, make sure to tick the box, so QS knows. Also, select Socks 4A. That's very important--if you're using TOR, Socks is set to 4A. For more info about TOR, see: online: The TOR Project.
Authentication
If your proxy requires authentication, you'll need to provide the necessary info.
User ID
Enter the User ID of the account you're authenticating.
Password
Enter the account password.