Just checked in the manual, you need a remote control. The original one is called Video Terminal, but an AV Terminal should work as well. The manual is available on this site for silver and gold members.
By the way, welcome!
Beovision LX5500, BeoCord V6000, BeoSound 9000, BeoLab 8000, BeoLab 3500, BeoLab 2000, BeoVox1, BeoCom 6000, Form1, LightControl 1