/usr/bin/perl /home/username/awstats/tools/awstats_buildstaticpages.pl
That's the important part. See the part that says, "username" ? This probably means that you cut/pasted it from a website that was trying to tell you what to do, not exactly how to do it.
The inference there, is that /home/webinfoguy25/awstats/tools exists as a directory ... you need to modify the URL so that it points to the exact place where the awstats_buildstaticpages.pl script lives.
Additionally, you want to type "which perl" at the prompt, to make sure that perl is installed in the /usr/bin directory. That is *most likely* where it is, but there is no requirement that this is so. If you type "which perl" and the shell answers "/usr/bin/perl" then you're good to go. If it says something else, then the (something else) is what needs to be in that part of this command.
Hope that makes sense ...
/p