To configure GTrends SE to use a proxy, open the Settings window by clicking the “Settings” button from the toolbar (it’s the next-to-last button). Then locate the “Proxy Settings” section.
Check Use a proxy and enter the proxy’s address in the Proxy box. The address should be in the form IP:PORT. “IP” is the unique numerical address of a server. If the address you usually use is a domain name, you can find the IP using this free tool.
The Username and Password boxes are just that. Leave them empty if your proxy doesn’t require a username/password.
Proxy settings take effect starting with the next keyword that is checked (yes, this means that if you set a proxy when GTrends SE is already processing a list of keywords, it will switch to using the proxy even if it’s only halfway through the list).