How can I watch epic times tv on my roku?
If you mean Epoch Times TV (EpochTV), it is currently only available through their website after login. You can then mirror/cast it to your Roku, or simply use an HDMI cable from a laptop to an HDMI port of your TV. Does not look like Epoch has developed Channels/apps for streaming devices yet.
You can watch individual Epoch Times videos through both Youtube and Rumble Channels for Roku. With Rumble, I have found it easier to set up all subscriptions (content creators you follow) from the website and then watch on the Roku. The Rumble Channel app is not the best/user friendly and sometimes doesn't work, but watch whatever I can there rather than Youtube when possible.
Just search for Epoch Times after you install either the Youtube or the Rumble Channel to your Roku.
Updated 7/9/21...
Appears that free EpochTV can now be installed on your Roku. From within Roku Home menu, navigate to Streaming Channels...Search...Epoch (should return Epoch TV). There appeared to be a couple more show hosts available on their online site than the Channel/app but appears very similar in content availability otherwise.