Ok Thank you for your help. I see the categories that want on the home page but how do I make those categories drop from the blog menu. For example when I click on blogs I want three categories to appear Job opportunities, community Service and events. I want to be able to select from there is this possible.
If you want to add categories in the submenu, please follow below steps:
1- Click on My Sites, then Customize.
2- In the Customizer, click the Menus tab.
3- Click on your menu then click on the reorder link.
4- Click up/down arrows to move a menu item up or down the list.
5- Click the left/right arrows to add or remove an item from a sub-menu / drop-down menu.