From your screen shot I`m guessing you`re trying to click and drag the selected motion on to your character?
You need to select your motion and then click the preview button and press the space bar.
You can use the sliders to adjust the results during this preview playback.
When you are happy with the result you press the space bar again to stop the preview and then press record and press the space,
When the recording is finished the motion will be added to your character in the time line.
Geoff.