best way yo do that is set the speed to zero, click the "play" button on the lower right, and then play with the sliders . . . you will see the result of whatever you try . . . for example, if you change the initial Y Position, the position of the quadraped will change in the +Y or -Y direction. If you change the Bounce, the character will bounce more.

You do not need to skin the character to find out what things are, all you have to do is set the speed to zero and then just play around with the settings . . . you will see directly what they do, and it will not hurt anything to play with the settings. If the settings get so far out of wack that things are all screwed up, all you have to do is click the "D" button and the setting will be returned to the original setting.

By the way, if you want to know what those buttons do, all you have to do is hold your mouse over them, and a tool tip will tell you.