I added a category, but whenever I go back to the main page, the categories don't show.

I did everything correctly, and I added forums to the categories.

However, the categories aren't showing, and the forums are all together.

Does anyone know how to fix it?

Sorry if this question has already been asked.

The link to my forum.

You first need to go to admin panel=>general=>Configuration=>Configuration and look for this option "Forum on holiday" and choose No. If you can;t see the categories go to admin panel=>general=>Homepage=>Hierarchy and from the "Split categories on index " choose the option which you like most.