You can describe proxy server parameters for a Project in its URLs field on a separate line after the starting URL:

http://www.server.com/

Proxy=1,proxy.mycompany.com:3128

Please do not use spaces. The first number means the proxy server type:

0 - no proxy, direct connection

1 - HTTP proxy

2 - SOCKS4

3 - FTP User@site proxy

4 - SOCKS5

5 - RTSP proxy

6 - CONNECT-type proxy

Then place the comma symbol followed by proxy server address, colon and the proxy server port number.