You can do this with the Roku app installed to your phone. In the Android version there is a magnifying glass icon in the upper right corner of the main screen that brings up the search dialog. The Apple version is likely similar.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T