Can anyone please explain to me how to slide to the bases?

One more thing. When you have a man out on a base. And the batter misses and the man on the base runs anyway trying to steal. As you may notice im not really inte the rules yet... =P
Well anyway. My question is how du you command your man to steal a base?

slide is not available on keyboard but if u have a control like logitech dual action...slides is the right analog..also to command ur runner trying to steal on a control u use the d-pad

There IS a key to slide on your keyboard and by default it's the "Shift" key press in the direction you're going and "Shift" and you should be able to slide, still don't know how to slide headfirst though, maybe you can only do that with a gamepad.