You don't say what model tv you have so we can't look it up, but most tvs have buttons controlling the more basic functions like power, volume, channel up/down, and input. Look around the edges, or on the back near the edges where they can still be reached from the front. Otherwise you'll need a remote compatible with the set.
- Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
- Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T
- TCL Roku TV 43S425/C107X, Ser X000001R60KV, wifi