There are two ways how to execute any template with proxy:
1. Set up proxy in the template. To do that you should add branch set->web broswser->set up proxy in the beginning of the template. For instance pull it from file or from list of alive ones.
2. Set up proxy directly from ProxyChecker in ZennoPoster. To do that you should add template on execution and set up proxy using there. List of alive proxy must be not empty in this case.