Make sure your Roku TV and casting device are connected to the same Wi-Fi network
Enable screen mirroring on the Roku TV if needed
On Windows, press Windows key + K and select your Roku TV
On Android, open the Quick Settings panel and tap Cast or Screen Cast, then select your Roku TV
On iPhone or iPad, use a compatible app with AirPlay and select your Roku TV if AirPlay is enabled
In supported apps like YouTube or Netflix, tap the Cast icon and choose your Roku TV
Confirm any on-screen prompt on the Roku TV if it appears
Start playing the content you want to cast
Stop casting from the device or app when finished