Gradient Tool

ok this may seem like a complete noobish question, and it prolly is, but i cant find it...please help me out

 

Right click the fill tool I think (bucket lookin thing).

 

You can also hold down the paint bucket, then select gradient.

 

or when you have text or a vectored shape you can also add a gradient to it as well.I suggest the allinone gradient, has a bunch of premades.

Here I attached it. I use it alot