Enable remote control via local network and write down the network settings:
From the main menu enter the "Settings" menu via the icon in the top-left corner of the screen.
Enter "Network".
On the left navigate to "Servers".
On the right enable "Enable webserver".
Write down the "Web server port" number.
Go back to the "Settings" menu and enter "System".
Write down the "IP address" that is displayed on the right.
Configure the extension:
Enter the extension's preferences page. In Opera press Ctrl-Shift-E, find
the TeleTube extension and click the configuration icon on the far right
and choose "Preferences".
In the Playback Device from the Device Type drop-down choose "Boxee / XBMC".
In the Device Address field type the IP address that you got in point 2.5 above.
In the Device Port field type the port number that you got in point 2.3 above.
Click Test Connection and if everything is OK click Save at the bottom of
the options page.
Test it: Go to YouTube, find a video and click the button that is placed over the video.