Soft body animating seriously anoying noob doubt

It is my first post. Here is my problem:
I am making a cristmas tree base folowing a tutorial and i put it on soft body. then i animate(alt+a) it and then click on space to stop the animation. i get the base(instead of a circle) i get something like a mat. but when i do something the mat goes back to the circle.
How do i get the mat to be always with that structure, i mean… looking like a floor to the cristmas tree… please help me.

It Worked… i hadn’t baked… jesus thanks men !!

http://file:///C:/Documents%20and%20Settings/Rafael%20Figueiredo/Ambiente%20de%20trabalho/Blender%20sof%20body2.JPG

i’m not totally sure what you’re meaning, maybe post a few screenshots? in any case, if you bake the softbody it should stay like it’s been animated…