Make sure your Roku device and casting device are connected to the same Wi-Fi network
Enable screen mirroring on Roku by going to Settings > System > Screen mirroring
Choose the screen mirroring mode you want
On Windows, press Windows key + K and select your Roku device
On Android, open Quick Settings and tap Cast, Smart View, or Screen Cast, then select your Roku device
On iPhone or iPad, use a Roku-supported app with the Cast icon and select your Roku device
Open a supported app on your phone, tablet, or computer
Tap or click the Cast icon
Select your Roku device from the list
Start playing the content
If the Roku device does not appear, restart both devices and reconnect to the same Wi-Fi network