By samoore (1253310290|%a, %b %e at %I:%M%p, last edited at 1253310290|%a, %b %e at %I:%M%p)
The blog template file is, in one way, just like any other file. So you create it like any other file (e.g., type the name in the address bar or in the "New page" box to the left).
But it's a special page for two reasons. First, it's named in a special way (i.e., a colon followed by "_template"). This name automatically links this template to all future files named with "blog:" followed by some string of words. Second, since it's a template page it can contain special characters and terms (all of those percent sign things).
In my course wiki, I have a template "annc:_template" for all pages (such as this one) that are named "annc:" followed by a string of words.