'How to install Jcalendar to intellij IDEA

I want to install Jcalendar(ps 2) on the Palette of intellij IDEA, how can I do it? I tried to follow the instructions on this page(ps 1), but it didn't work. Intellij IDEA can't even find the components I downloaded.

ps 1. https://www.jetbrains.com/help/idea/adding-gui-components-and-forms-to-the-palette.html

ps 2. https://toedter.com/jcalendar/



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