Hi,
With Menu custom you can admin->SNS theme -> menu(Select status-> Drop with static block and Select static block……).
With default category you can admin-caatalog->menu-> tab camen menu-> Select colum and import html.
Attachments:
New-Category-_-Manage-Categories-_-Categories-_-Catalog-_-Magento-Admin-Mozilla-Firefox-2015-06-29-09.36.12.png
Configuration-_-System-_-Magento-Admin-Mozilla-Firefox-2015-06-29-09.26.53.png
