To install Player on the Roku set-top box,
Sign in the Roku site http://owner.roku.com. If you have no account, create a Roku account and then link the Roku set-top box to the created account. http://www.roku.com
If you forgot the email used for signing in, it can be checked via the set-top box. Go to the settings: Settings → System → About.
After signing in, follow the link in a web browser: https://owner.roku.com/channels/detail/5JNHJL5. Click – Add channel
Go Settings → System → System Update on the Roku set-top box and click Check Now. Then Player will be installed on the Roku set-top box.