Hi @estisw1966,
Welcome to the Roku Community.
We apologize to hear that you want to screen share your mobile device but having trouble. To use screen mirroring, you must first set up and enable the feature on your Android or Windows device and then request a connection to your Roku device.
To help you further, visit our support page: How to screen mirror your Android or Windows phone to your Roku streaming device
Note, that even though the terms “casting” and “screen mirroring” are commonly interchanged in the industry, there are differences when using them with your Roku device, review the detailed article about casting.
Hope this helps. Keep us posted.
Regards,
Nimfa
