Total N00b in Sharepoint land here, pls forgive my ignorance, trying to drink as fast as I can from the firehose :)
I was tasked with upgrading a WSS 2.0 site to SPF 2013 (yes, it can be done; no, you don't want to do it...) I have one content db with one web application, that contains two site collections (one is at the base "/" URL and is unused, and the one I'm concerned with is located at "/sites/management".) After the upgrade, both sites has a SPF 2010-looking theme (not sure of my term usage here, so hopefully I don't confuse anyone...) On the site at "/", there was a link at the top in a pinkish field that said "Experience all that SharePoint 15 has to offer. Start now or Remind me later", which took me to an upgrade screen. I did go ahead and do the upgrade, and now that site looks like the default SPF 2013 sites I see in the books and documentation I've been reading (the one with the blue block at the upper left with the SharePoint logo.). However, it did NOT update the site look at "/sites/management". There is no link to upgrade the site at the top of that page as there was on the "/" site. How can I change the "theme" of this site to be the default SPF 2013 one?