[Gimp-user] apply gradients to the canvas/area , err msg: "Blend does not operate on indexed layers"

[Avraham Makeler]

Hi all,
Once I have finished defining my new gradient how do I apply the gradient to
the canvas/area?

What do I have to do with the gradient window, if anything?

How do I actually apply the new gradient. I have tried using the Fill tool,
and that just fills the area with the Foreground color, and I have tried
using the Blend Tool, but it tells me

Blend does not operate on indexed layers.

Am I supposed to be using that operation (Blend)? If so how can make my
layer not indexed?
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