I had not checked before, but it looks like the install of the pacman package did actually add an entry under Games --> Arcade, but without any icon image. I don't think the pacman package included an icon image for it, so if you really want the icon to be something other than "blank sheet of paper" you may have to make your own (that's another topic) and use Menu Editor to change the properties of the pacman entry in the menu. But, looks like right now the bigger problem is just running the dang thing, since we both seem to be experiencing the same error messages.

Note the the items you see in the menu are nothing more then files ending in ".desktop". I like to think of them as a kind of equivalent to ".lnk" (shortcut) files you see in MS Windows in places such as \Documents and Settings\All Users\Start Menu\Programs. For KDE, the main places to look are under /usr/share/applnk (for items that all users can see in the menu), and in one's own home directory under /.kde/share/applnk. Note that any files and directories beginning with "." are "hidden" and do not show up by default when using ls or Konqueror, so you may have to change settings accordingly to see them. You may want to open one of the .desktop files with KEdit and have a look around. They are nothing more than another way to run a program or script, which as you've learned you can do from a shell prompt as well.

(Guys, as I'm trying to learn Linux myself, if I state anything here or in other posts that is incorrect please let me/us know so that I am not misinformed about a particular feature or setting. Thanks!)