Illustrator Gradiant

I've added a gradiant to the grey disk, I did this by selecting to circle shape and then up on the top bar and click teh first square.

Then pick the gradiant box, which is White to Black.

the circle then gets the gradiant, then I select the gradiant tool from the side bar, this makes the tool appear on the image which lets me change where the graiant starts and the angle aswell as length.

on the right of the above image is the gradiant windwo which is accesed from the right side bar clicknig on graiant, here I cna change what colours the graiant uses aswell as adding new colours and chnaging the distance between them.