Animation on Press Button

Hello everyone, I will try to explain my problem briefly, i want to remind that i am new here.. If you help me i will be thankful. I made a 3d human animation walks and sits in the chair, those actions happen when i press the button, but i want to make possible that when i press the button each time the animation starts all over again. Now, i just press the button and it is doing well all actions, however if i press again, it is not start from the beginning position(loop, works with UI button). Thank you.