Directory plugin - problems with shortcodes

I am using the Directory plugin, but I need my theme, so I am using the shortcodes... but how can i edit the CSS ...

I want to do several things e.g.
-- change letter size in grid view
-- remove "posted by metadata"
-- change look of buttons
-- change excerpt length
-- how to add search button for the directory?
-- change the way featured images show

Ideally I want to make the plugin look more or less like the demo except through shortcodes and editing code as necessary.

Please help with this...

link to my site here: