How I can change the position and size of the text of the description

I’m trying to change the theme to get the e404 text box appears centered and with large print, and that has a title and description optionally each slide, not just description, as I can get it?
It would be too good you might have the option to configure it manually from the admin panel of the plugin.
Another interesting thing would be to have navigation bar optionally in the form of numbers or points

http://wordpress.org/extend/plugins/m-vslider/