Blossom - Navigation Menu
Navigate to Dashboard > Appearance > Menus and click on “Create a Menu.”
Select the items you wish to add to the menu, and click “Add to Menu”. Drag and drop the items into the order you wish them to appear.
Assign the menu to a Theme Location at the bottom of the menu.
In the Blossom theme, the navigation at the top is the Secondary Navigation. The Primary navigation is set to display directly underneath the header and isn’t shown in the demo but can certainly be added.
To get the navigation to the right of the logo, you’ll add a Custom Menu widget to the Header Right widget area.
More information on setting up the Navigation Menu can be found here.