There are many ways to manipulate tags in the gradient editor to create a custom gradient.
Click the color tag or opacity tag to move.
Do one of the following:
Drag the color tag left or right.
Use the Location slider (or adjacent value slider) to modify the position of the selected tag. A value of 100% is the rightmost position of the gradient, and a value of 0% is the leftmost position of the gradient.
Option-drag the tag to a position.
Drag the small triangle between adjacent color tags or opacity tags to change the point where one tag’s effect ends and the next tag’s effect begins. The closer the middle control is to a tag, the sharper the color or opacity transition.
Note: The middle control does not appear for color or opacity tags set to Linear or Constant.
Click a tag, then choose Constant, Linear, or Continuous from the Interpolation pop-up menu.