Is there a way to change the url structure of a theme?

hi there, i have a site i'm working on called brandluck.com. I am trying to change the url structure, but it looks like it's a part of the theme. Can you lead me in the right direction to possibly do this? I can give you the login info to see: This is what i'm trying to do. Change http://brandluck.com/work/ --> should become http://brandluck.com/names/
http://brandluck.com/work_category/ --> should become http://brandluck.com/names-category/
http://brandluck.com/work_tags/ --> should become http://brandluck.com/names-tags/
The theme is called Caja by Luis Zuno
Thanks,
Brian