Hi Sarah Fischer. You have a few options to stream Grokker videos on your TV using your Aetna sign-in. You can either use AppleTV, Roku, or connect your computer to your TV with an HDMI cable. Here's a great article that talks about how to do any of these: https://grokker.com/blog/everything-else/5-ways-to-get-grokker-on-your-tv/ . Keep in mind that since you already have a Grokker account, you won't want to use the Comcast streamining option (that would require a separate membership). Hope that helps!