Well, how about the connector marked "TV/AUX", smack in the middle?
If it doesn't work simply selecting "AUX" from the panel, there's some other problem with your setup. On a Beolink 1000, you select it with SHIFT-RADIO. If you don't have any B&O video equipment, you could program the Beocenter to option 2, and then you can select AUX simply with TV.
(The MIC input is selected using AUX-8, but you can't use it - firstly, it's mono, and secondly, the signal levels are all wrong. Phono is unsuitable as well, since it has the RIAA preamplifier in the way)