public void Add( 
   ICookieContainer container
)

// create new cookie container
var container = new CookieContainer();
// use new cookie container for http request
ZennoPoster.HTTP.Request(InterfacesLibrary.Enums.Http.HttpMethod.GET, "https://zennolab.com", cookieContainer: container);
// add the contents of the new container to profile's container
project.Profile.CookieContainer.Add(container);