Help Document for Categories and Tags
First, add your categories.
Go to your dashboard [http://yourblog.wordpress.com/wp-admin]
Go to Posts –> Categories
Add a category: Add the name and description. Click “Add New Category”
Create a post and check your category. This is the old editor [notice I use tags as well].
Here is the new post editor:
So: We’ve set up categories. We’ve written posts and selected the categories.
Now to set up the menus:
Go to your Dashboard.
Go to Appearance–> Menus
In the Dyad theme, it looks like this; add to your primary menu by clicking “categories” then “view all” and checking those you want in your primary menu. Click “Save Menu”
Your menu structure will look like this:
The blog should look like this:
Clicking the menu items will now bring up all posts under each category.