New Student trying to figure something out with Illustrator

[Acorn]

I don't think this is what you are looking to do but, this is 3 different colored rectangles blended, basically the pinkish and blue blended converted to editable shapes then the orange rectangle blended to that.

Larry, I don't think the ask is for a Xara-style Blend.

I took it to be a gradient Fill with colour stops. My attempt is a Linear Fill across all the boxes selected together.
I added in a page background as well.



I could have instead created a lot of black boxes on a white background and placed a large box with colour-stopped fills on top and set it to a Screen (Bleach) Transparency.

Acorn