How to fix no active image found in material slot I'm learning the texturing,give color, uv unwrap and baking through tutorial on youtube.

Somehow i got this error "no active image found in material slot"

( link 1: https://imgur.com/a/MBU4OuQ )
( link 2: https://imgur.com/lgtMQfq )

tried to solve it by reading forum but still cannot understand what does it mean by material slot, let alone to fix it.

what did i do wrong? need help.
version used: 2.8
To bake into an image you need to have it selected in the Node editor

you don't have to connect it to anything

just an image texture node then select the image you want to bake on and make sure that the node is selected