I had the regular Roku app on a couple of phones.
Previous dumpsters produced a Streaming Stick in, say, 2016. And you'll recall I found a Roku Express on the afternoon of the highly entertaining Giorgi Zoom/tOSU preview.
So I know a couple of things about using a Roku. The most important thing to know is that it sucks.
Anyway, the TCL Roku TV has its own app. I downloaded that, and also programmed a universal remote to get the thing on.
It has the notorious TCL Roku TV black screen problem. I got the menu up and running so I know the screen is intact, and looks good. But I don't need a big TV right now, so I offered it to a fellow freecycler who enjoys fixing electronics.