1- Go to Tools -> BlockPuzzleGameToolkit -> Editor -> Color editor
*Saving is done automatically.
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In the inspector, you will see the editor. Use Unity tools to make changes.
If you want to create / delete a new block -> use "+" and "-" buttons.
If you want to rename the new block, you can find it at this path: Project -> Assets -> BlockPuzzleGameToolkit -> Resources -> Items.