If I have trouble connecting, I will restart Blender. Then Init Chordata Mocap Session. Remove the Cube from scene (if there is one). Then from Chordata menu, Add a Mocap Avatar.
Make sure the Armature node box has Chordata_biped selected with Calibrate button underneath. If not, make sure Chordata Full Biped is selected in the Node window.
Click Connect button -- avatar should respond to movements but will likely be twisted up. Face south in the T-pose and click Calibrate button.
That should do it. Touch your nose and look at the Blender window -- re-calibrate with arms higher/lower and/or further forward/backward until you can touch nose. Remember that pose for re-calibrating.