Hi @alina1618,
Welcome to the Roku Community!
We're happy to help you set up your Roku device with a Roku remote. Please be advised that your phone or tablet must be connected to the same Wi-Fi network as your Roku device in order for them to be paired. If, in any case, your Roku device and mobile phone are not connected to the same network, we highly suggest that you use a physical remote to connect them. You can check out this link here for more details on how to connect the Roku mobile app to your Roku device over Wi-Fi.
Please let us know if there is anything else we can do to help you.
Best regards,
Eunice
Eunice L.
Roku Community Moderator