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You can configure EXM.RendererUrl in the Sitecore.EmailExperience.Core.config config file.

In case the setting is empty, the RendererUrl is resolved on the first request to the application. In the <httpRequestBegin> pipeline, there is a Sitecore.Modules.EmailCampaign.Core.Pipelines.HttpRequestBegin.OnHttpRequestBegin processor that that does that:

GlobalSettings.RendererUrl = WebUtil.GetServerUrl(args.HttpContext.Request.Url, false);

You said that it worked ok previously on HTTP, but after you switched to HTTPS, it does not work. First I would focus on fixing the SSL/TLS issue. I bet that there is some problem with the certificate.