Sorry, I will try again.
Have a look here for a simple circuit diagram. Yes, your description sounds alright, just add the resistor from Bela's analog input to ground.
With1K resistor and a 6.8nF capacitor you get a cutoff frequency of about 23,405 Hz.
This being a high-pass filter, it means that you are cutting off all the audio spectrum.
Instead, you'll want the cutoff frequency to be as small as possible, so that only the DC is blocked but no useful sound content is blocked. Aim for a cutoff below 50Hz.
Larger capacitors are expensive and tend to be less linear. Larger resistors tend to add to the noise level (though probably do not make a huge difference here). On the other hand, depending on the source of your signal, you may want a large impedance (large resistor). Piezo discs and guitar pickups will probably want a large ( > 100k ohm) impedance, while line-level outputs (from virtually any active audio circuit), will be happy with 10k or 1k ohm.
As an example, to get 26.5 Hz, you can get a 680nF capacitor and a 10k ohm resistor.
Hope this helps.