If I enter a SiteID in the search box (on the 'Sites' page), it doesn't work. The string of numbers in the admin panel doesn't match the Site ID, so how do I find a site from a list of hundreds or thousands?
Ok, I recommend you to use 3.0.2, cause only in this version 'owning sites' feature works correctly (there was a bug with SiteId).
The search of the site knowing it's SiteId to edit publish properties is imposible by using 'search' box. But you can use a little trick. Enter path http://<host>/Admin/Site/Edit?siteId=<SiteId> manually in browser's path bar.
If you want to edit site in wizard, I guess you already know the URL (which contains SiteId).