Problem with nodes

hello everyone,
I’m trying to follow a tutorial and make a monster, and we need to use nodes.
I have already turned on nodes wrangler in the preferences menu, but I still can’t add any nodes onto the screen, anyone got an idea on what to do? thank you!

Did you add a material to the object?
(You can do it in Shader Editor top bar or Material Properties)

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ohh, I didn’t!! thank you for the advice!!!