Thanks for your kind replies.

I came back here to report how I fixed it, only to see similar suggestions. Thank you also for the quick response. Scoot to the bottom for the fix(s) I used.
I have to admit, I am fairly new to OSX, and this iMac is only days old. I've never been under the hood of OSX or Unix. Yet, I've worked on Macs for years, although only recently under OSX. For what I do (prepress), there isn't much call or time to play with stuff, partially the reason I bought this iMac. Last two computers I've owned are dedicated PC gaming machines.
Anyway, I
knew the prefs/settings/conf/cfg file must be kept in the temp folder, and remember seeing that it was in my user folder from a previous time I was in the options.
Following the help instructions in OSX, I tried to find the file/folder with the
invisible filter, but for some reason nothing would show up, anywhere, any name (like .Trash, which I know exists), no matter what I did. I thought maybe it was an administrator rights problem, and even though I am set as admin I am not getting the rights. I read up on this some, as well as doing several searches on finding/viewing invisible files. Finally got a hint from a post on another forum to use terminal: ls -a command.
Bingo, I could now see hidden files. I then just had to figure out how to navigate to the folder -- cd .aMule... duh, then somehow get terminal to edit the file (got that on first guess, open amule.conf. The lines I need to change were right there.
In the midst of all this, I found a much easier way to access hidden files and folders, while pondering if I should activate and setup root login. And thats with a program called TinkerTool:
http://www.bresink.de/osx/TinkerTool.htmlFlip one switch, and all is visible and editable. I am certain I'll need this again in the months to come.