To cast or mirror to your Roku device just follow the instructions below.
First, make sure your mobile device and Roku device are connected to the same Wi-Fi network
Go to “System Settings”
Select “Screen Mirroring” and choose “Enable Screen Mirroring”
Next, visit the notification tray on your smartphone or tablet device and select “Screen Mirroring” or “Smart View”
Choose which Roku device you want to connect to and start enjoying FreeCast!