Wiki Not Working on My Site

I just installed your Wiki software on my site. It seemed to install just fine, and the wiki options appear on the sidebar. When I tried to create a test wiki, however, the URL for the test wiki shows nothing. I'm clearly doing something wrong here, but I'm not sure what and I can't get it to work. I'd love to use this sofware, as it seems to be exactly what I need, but I can't use it if I can't get it to work.